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1.
黄锦海  郑博 《眼科研究》2012,30(12):1139-1143
眼内散射光是由于光线在人眼内发生散射,降低了物像在视网膜的对比度,从而影响了视觉质量的物理现象。眼内散射光是失能性眩光的主要原因,可以引起各种不适症状。正常人眼的散射光由角膜、虹膜、巩膜、晶状体及视网膜组成,当这些屈光介质出现混浊或病理变化时,都可能引起相应散射光的增加。虽然目前存在多种测量手段及测量参数,但是仍然缺乏对散射光测量过程的统一化及散射参数定义的标准化,需要进行更为深入和广泛的研究。就眼内散射光的基本概念、来源、临床意义以及各种测量方法的研究进展进行综述。  相似文献   

2.
Purpose:  To find objective chart tests that give a measure of visual function in the different age-related cataract morphological groups and can be applied in a clinical setting.
Methods:  Subjects with age-related cataract ( N  = 33) were recruited to the study from both private optometric practice and a hospital eye department. All subjects underwent LOCS III grading of their cataract and had their functional vision assessed using the VF-14 questionnaire. High (96%) and low (16%) contrast logMAR visual acuity were measured together with Pelli–Robson contrast sensitivity. A stepwise linear regression was then performed on the data to find significant predictors for VF-14 in the three age-related cataract morphological groups as well as in a mixed group.
Results:  Low contrast logMAR visual acuity was a significant predictor of VF-14 in the cortical ( p = 0.014 ) and nuclear ( p = 0.024 ) subgroups. For the mixed morphological group both high and low contrast visual acuity were significant predictors ( p < 0.03 ). There were only three subjects with pure posterior subcapsular cataract and so no meaningful analysis could be performed.
Conclusions:  Low contrast logMAR visual acuity may be a better predictor of visual function in cortical and nuclear cataract compared with high contrast logMAR visual acuity or Pelli–Robson contrast sensitivity.  相似文献   

3.
Straylight effects with aging and lens extraction   总被引:1,自引:0,他引:1  
PURPOSE: To assess possible gains and losses in straylight values among the population to consider straylight as added benefit of lens extraction. DESIGN: In this cross-sectional design, data from a multicenter study on visual function in automobile drivers were analyzed. METHODS: On both eyes of 2,422 subjects, visual acuity (logarithm of the minimum angle of resolution [logMAR] in steps of 0.02 log units), straylight on the retina (psychophysical compensation comparison method), and lens opacity (slit-lamp scoring using the Lens Opacities Classification System III [LOCS III] system) were determined. Three groups were defined: 220 pseudophakic eyes, 3,182 noncataractous eyes (average LOCS III score, <1.5), and 134 cataractous eyes (average LOCS III score, >3.0). RESULTS: Noncataractous straylight values increases strongly with age as: log(s) = constant + log(1 + (age / 65)(4)), doubling by the age of 65 years, and tripling by the age of 77 years. Population standard deviation around this age norm was approximately 0.10 log units. The cataract eyes (in this active driver group) had relatively mild straylight increase. In pseudophakia, straylight values may be very good, better even than in the noncataract group. Visual acuity and straylight were found to vary quite independently. CONCLUSIONS: Lens extraction holds promise not only to improve on the condition of the cataract eye, but also to improve on the age-normal eye. Lens extraction potentially reverses the strong age increase in straylight value, quite independently from visual acuity.  相似文献   

4.
早期白内障患者,视力还没有受到影响,但常有眼前光幕遮档,夜间驾驶困难等主诉,究其原因,可能是视功能的一项指标——散射光值出现了改变,因此伴随眩光的主诉。白内障术后人工晶状体眼的患者,有可能主诉视野中出现光圈、光晕、闪光、亮点等,这也是眩光幻影所致。眩光是指视野中干扰光源的存在导致视力的减退,换句话说,就是由于散射光的存在导致视网膜成像对比敏感度的减退。本文就眩光研究目前取得的共识与近期的新进展展开论述,并针对眩光的影响因素提出相应的解决方法,为进一步的研究提供线索。  相似文献   

5.
Potential acuity meter results in cataract patients   总被引:4,自引:0,他引:4  
Purpose : To determine the ability of the potential acuity meter (PAM) to predict potential visual acuity through lenticular opacities in a group of cataract patients without significant other ocular pathology. Methods : This prospective study undertook PAM measurements on each eye of 84 subjects during preoperative hospital visits to either A Scan or Primary Care clinics. PAM results were compared to best corrected visual acuity findings obtained at least 6 weeks post‐cataract extraction. Results : Comparison of PAM result to visual outcome showed poor correlation (rho = 0.41, P = 0.0005). Using predictive estimates, 49% of subjects’ PAM results underestimated visual outcome as determined by a difference of greater than 2 Snellen acuity lines in these results. Factors such as preoperative vision level, cataract type and pupil dilation did not significantly influence the predictive power of the PAM. Preoperative pinhole results were also correlated with visual outcome (rho = 0.42, P = 0.0006). Vison in the fellow eye of subjects with 6/9 or better was correlated to the PAM result indicating a moderate to good predictive power in ‘normal’ eyes. Conclusions : PAM results were considered to be poor for a clinical test. The results of this study indicate that this instrument has only a limited usefulness as part of the standard preoperative examination in patients undergoing cataract extraction.  相似文献   

6.
PURPOSE: To quantify cataract patients' functional visual complaints and correlate them with their objective glare disability and spatial contrast sensitivity (SCS) scores. SETTING: Sir Mortimer B. Davis Jewish General Hospital. Montreal, Quebec, Canada. METHODS: Thirty patients scheduled for cataract surgery with a visual acuity of 20/70 or better at the time of patient selection and no other ocular pathology were evaluated objectively and subjectively for visual function preoperatively and within 3 months postoperatively. Objective measures of SCS and visual acuity in the presence and absence of glare were obtained with the Optec 3000 vision tester. Subjective visual function was evaluated with the Activities of Daily Vision Scale (ADVS), a questionnaire that evaluates patients' visual function by assessing the degree of difficulty they experience in performing tasks involving distance vision, near vision, and glare conditions. RESULTS: Preoperatively, patients had decreased visual acuity and SCS in the presence of glare. The ADVS scores were correlated with visual performance. Postoperatively, there was a statistically significant improvement in all dependent measures (i.e., visual acuity and SCS in the presence of glare) as well as in the subjective report of visual performance assessed by the ADVS. CONCLUSION: Spatial contrast sensitivity, glare disability, and the ADVS questionnaire should be considered as adjuncts to visual acuity testing in evaluating certain cataract patients.  相似文献   

7.
PURPOSE: To determine the impact of vision impairment and eye diseases on vision-specific quality of life and visual function in an older population of rural southern India. METHODS: Presenting and best-corrected visual acuity and burden of eye diseases were determined in a population aged 40 years and older, identified through a random cluster sampling strategy from 50 villages of rural south India. A questionnaire validated previously for use in this population was used to ascertain quality of life and visual function. Visual acuity measurements were obtained with illiterate E Early Treatment Diabetic Retinopathy Study (ETDRS) charts. Cataract was graded and defined based on the Lens Opacities Classification System (LOCS) III. Macular degeneration was defined based on the classification system proposed by the International ARM Epidemiologic Study Group. Glaucoma was defined based on results of clinical examinations including optic disc and visual fields. Analyses were performed to explore the relationship of overall and subscale quality-of-life and visual function scores with presenting acuity in the better-seeing eye, specific eye diseases, and demographic variables. RESULTS: Information on quality of life and visual function were available for 5119 (99.4%) of 5150 study subjects. The mean presenting visual acuity in the better eye was 0.76 +/- 0.53 logMAR (logarithm of the minimum angle of resolution) units. Age, education, occupation, presenting acuity in the better eye, and presence of a cataract, glaucoma, or refractive error were independently associated with overall quality-of-life and vision function scores. After adjustment for demographic variables and ocular disease, persons with vision impairment or bilateral blindness based on presenting visual acuity had lower scores across all domains of quality of life and vision function. Scores for subscales of quality-of-life and vision function domains were significantly lower among those with age-related cataract and glaucoma compared with persons without those eye diseases. CONCLUSIONS: Presenting vision in the better eye was associated with quality of life and vision function in this older population of rural south India. Subjects with glaucoma and age-related cataract had an associated decrease in quality of life and vision function, independent of presenting visual acuity in the better eye.  相似文献   

8.
Stray light of spectacle lenses compared with stray light in the eye.   总被引:2,自引:0,他引:2  
Stray light in spectacle lenses may affect the overall vision. It may also affect the measurement of ocular stray light, contrast sensitivity, or glare sensitivity. This article describes common stray light characteristics for glass and plastic spectacle lenses and compares this to the stray light characteristics of the eye, which are well known from the literature. Stray light is described by the skirts of the point-spread function (PSF), which were measured for angles from 4 degrees to 30 degrees. The PSF of spectacle lenses appears to follow the equation PSF = a(10). (theta/10)b, with a(10) and b representing fitting parameters and theta representing the stray light angle. The slope b is on average -2, which similar to that of the eye. For clean spectacle lenses, the PSF is usually at least an order of magnitude lower than that of the eye, whereas "as worn" (uncleaned) spectacle lenses may approach the PSF of the eye. To reach the PSF of the eye, the spectacle lens needs to be contaminated by as much as one or two fingerprints. The article also shows that plastic spectacle lenses degrade much faster than glass spectacle lenses when looking at the amount of stray light.  相似文献   

9.
PURPOSE: To evaluate the relationship between contrast acuity at declining contrast levels and the type and density of lens opacity in cataract. METHODS: Contrast acuity at declining contrast levels was determined with the Holladay Contrast Acuity Test, in relation to the type and density of age-related cataract in 180 patients with bilateral cataract and 20 control subjects with normal macular function. Cataracts were graded according to the Lens Opacities Classification System (LOCS) III of nuclear color (NC), nuclear opalescence (NO), cortical (C), and posterior subcapsular (P) cataract. Best-corrected visual acuity and near contrast acuity were determined in randomized order monocularly in both eyes. Visual difficulties in everyday life were evaluated, using the VF-14 questionnaire and the Cataract Symptom Score. RESULTS: The contrast-dependent effect of cataract on contrast acuity was statistically significant (P < 0.001; two-way ANOVA). In the comparison of early, intermediate, and advanced nuclear, nuclear-cortical, and posterior subcapsular cataracts (PSCs), significantly reduced contrast acuity scores were found for the PSC groups (P < 0.001). Comparison of nuclear and nuclear-cortical cataracts showed the contrast acuity scores to be comparable at all contrast levels (P > 0.05). High correlation coefficients were found between the LOCS III P score and the contrast acuity measurements (r = 0.77-0.84; P < 0.001). In contrast, the correlation coefficients of the NO, NC, and C scores were considerably lower (r = 0.45-0.66; P < 0.001). High correlation coefficients were also found between the contrast acuity measurements and self-reported functional vision. CONCLUSIONS: The statistically significant, contrast-dependent effect of cataract on contrast acuity supports the clinical relevance of recording visual acuity at low contrast levels in patients with age-related cataract. Particularly, the severity of PSC has a strong influence on the impairment of contrast acuity. Contrast acuity corresponded closely to the self-reported visual difficulties in everyday life.  相似文献   

10.
AIMS: To ascertain the prevalence of cataract in a representative group of men who have been followed since 1979 for cardiovascular disease. METHODS: Of 2348 men aged 45-63 recruited in 1979 to the Speedwell Cardiovascular Study, 1420 were alive and willing to take part in further studies in 1997. They were sent a questionnaire about their eye health and invited to an ophthalmological examination at Bristol Eye Hospital. Cataract was graded using the Lens Opacities Classification System III (LOCS III) method. RESULTS: Of the 1420 men, 26 died before they could be examined. Out of the remaining 1394 men, 949 presented for examination and full information was available for 936. Some information about eye health was obtainable for 394 men and 51 were not contactable. The prevalence of cataract increased with age and 36 men (3.8%) had had previous cataract surgery in either or both eyes. Of the remaining 903 men with no previous history of cataract surgery, cortical cataract was present in the right eye of 75 men (8.3%), nuclear (opalescence) in 128 (14.2%) and posterior subcapsular in 15 (1.7%). Five men (0.6%) had visual acuity of 6/60 or worse attributable to cataract in the right eye and 232 (25%) had visual acuity in one or both eyes of 6/24 or less at least partially attributable to cataract. There was no association between social class and the presence of cataract. CONCLUSIONS: The prevalence of cataract in a representative cohort of men followed since 1979 for cardiovascular disease was comparable to that previously reported in the UK and is consistent with studies from around the world. It appears that substantial amounts of visual loss, attributable to cataract, are present in men. Further studies establishing the reasons for this should be undertaken.  相似文献   

11.
Cataract patients and healthy subjects have been examined with the Miller-Nadler Glare-Tester to prove if the results of the glare test show any correlation between the glare disability score and the outdoor visual acuity facing sun. The outdoor vision of cataract patients with a high glare disability score was clearly impaired compared with their indoor vision. Healthy eyes with a normal glare disability score did not show any impairment of visual acuity facing sun. The results of the glare disability examination can therefore be used as a reference for the decision of a cataract operation.  相似文献   

12.
PURPOSE: Contrast and glare sensitivity tests are now being used as adjuncts to visual acuity in the assessment of visual function. Limited data are available on the associations of the former tests with cataract type and severity. The aim of the study is to assess these associations using standardized techniques. METHODS: Contrast sensitivity tests (using the Pelli-Robson chart) and glare sensitivity tests (using the Vistech MCT 8000) were done on 128 patients with cataracts and no other ocular disease and on 29 control volunteers. The cataracts were graded using the Lens Opacities Classification System II (LOCS II). Data from the left eyes were analyzed using logistic regression models. RESULTS: Contrast sensitivity loss was associated with cataract severity for cortical (P less than 0.0001) and posterior subcapsular (P = 0.0001) cataracts and with decreased visual acuity (P = 0.0001). Night and day glare sensitivity were each associated only with increased severity of posterior subcapsular cataracts (P less than or equal to 0.003) and with decreased visual acuity (P less than 0.001). Additional analyses showed that contrast and glare sensitivity were similar in eyes with no cataracts and early cataracts. CONCLUSION: These results suggest that the Pelli-Robson Chart and the Vistech MCT 8000 are good techniques for evaluating visual function in moderate to advanced cataracts. However, for early cataracts, other techniques need to be explored to assess visual function loss.  相似文献   

13.
Purpose: To evaluate the efficacy of Fourier analysis of digital retinal images in grading cataract severity. Methods: A total of 330 eyes from 165 patients were divided into 287 phakic and 43 pseudophakic eyes. All patients underwent clinical examination, colour fundus photography and photoscreening. Phakic eyes were classified into 232 cataractous and 55 control eyes using the Lens Opacity Classification System (LOCS III). Assessment was repeated at 6 weeks postoperatively for 157 eyes in the cataractous group and in 24 pseudophakic eyes. The predictive value in assessing cataract severity using discrete Fourier transforms in fundus image analysis was compared with LogMAR visual acuity and LOCS III grading. Results: The mean age of the population was 71.7 years ± 13.4 (range 19–92) there were 70 (42.4%) males and 95 (57.6%) females. The mean LogMAR visual acuity was 0.44 ± 0.41 (range ?0.2 to 1.4). In the cataract group there were 232 eyes (80.8%), the mean age was 75.5 years ± 9.3 (range 21–92). Fourier analysis of retinal images showed a moderate correlation with LOCS III (R2 = 0.59) in grading cataract severity and demonstrated a comparable correlation with visual acuity (R2 = 0.39) as LOCS III (R2 = 0.44). As with LOCS III score the Fourier value had a poor correlation with visual acuity in clear (R2 = 0.05) and pseudophakic lenses (R2 = 0.07). Conclusion: Fourier analysis is a useful automated method in grading of cataract severity for both pure and mixed types of cataract; however, similar to many objective systems it cannot determine the anatomic type of cataract.  相似文献   

14.
PURPOSE: To investigate whether multifocal electroretinogram (mfERG) topography would be affected by nuclear cataract. METHODS: Multifocal electroretinograms were recorded from 10 elderly subjects (10 eyes) with nuclear cataract of grade five (LOCS III) before and after cataract surgery (phacoemulsification). Their visual acuity before the cataract surgery was between 6/12 and 6/18. The postoperative period was from 2 to 3 months. None of the subjects had any significant eye disease apart from cataract. The mfERG responses were grouped into six concentric rings for analysis. Both the amplitudes and the latencies of N1 and P1 of first-order responses were used for analysis. RESULTS: N1 amplitude only from ring 1 increased significantly after cataract surgery. P1 amplitude from ring 1 and ring 2 also increased significantly after cataract surgery. The latencies of neither N1 nor P1 from all rings changed significantly. CONCLUSIONS: Nuclear cataract could affect the topography of mfERG, so clinicians should be aware of the effects of cataract when interpreting mfERG responses in cataract patients.  相似文献   

15.
Purpose : To examine associations between eye disease and tests of visual function with self‐reported visual disability. Methods : The Blue Mountains Eye Study is a cross‐sectional census‐based survey of eye disease in two postcode areas in the Blue Mountains, west of Sydney, Australia. Of 4433 eligible residents, 3654 (82.4%) participated. Subjects had a detailed eye examination, including tests of visual acuity, contrast sensitivity, disability glare and visual field. Lens and retinal photographs were taken and graded according to standardized protocols for presence of cataract, early and late age‐related maculopathy, glaucoma, diabetic retinopathy, retinal vein occlusion and other eye diseases. An interviewer‐administered questionnaire included questions about perception of visual disability. Results : Scores on all tests of visual function significantly decreased with age (P < 0.0001). This decrease persisted for all tests except disability glare after excluding subjects with identifiable eye disease. The presence of one or more eye diseases was significantly associated with all (self‐reported) measures of visual disability (trouble driving at night, difficulty recognizing a friend across the street, reading a newspaper or recognizing detail on television); mixed cataract (cortical and nuclear, or posterior subcapsular and nuclear) was associated with trouble driving at night and difficulty recognizing a friend across the street. A 10‐letter (two‐line) decrease in best corrected or presenting visual acuity was significantly associated with all self‐reported measures of visual disability, as was a two‐step decrease in contrast sensitivity. A five‐point increase in points missing in the visual field was weakly but significantly associated with all self‐reported measures of visual disability except trouble driving at night. Conclusions : Visual function declines with age. Impaired visual function was strongly, and eye disease relatively weakly associated with reports of visual disability.  相似文献   

16.
Purpose: To study the relationship between lens opacity and intraocular straylight, visual acuity and contrast sensitivity. Methods: We investigated 2422 drivers in five clinics in different European Union (EU) member states aged between 20 and 89 years as part of a European study into the prevalence of visual function disorders in drivers. We measured visual acuity [Early Treatment Diabetic Retinopathy Study (ETDRS) chart], contrast sensitivity (Pelli–Robson chart) and intraocular straylight (computerized straylight meter). Lens opacities were graded with the Lens Opacities Classification System III (LOCS) without pupillary dilation. Participants answered the National Eye Institute Visual Functioning Questionnaire – 25. Results: Intraocular straylight was related more strongly to LOCS score than to both visual acuity and contrast sensitivity. Visual acuity and contrast sensitivity were correlated to each other well, but to intraocular straylight to a much lesser extent. Self‐reported visual quality was best related to contrast sensitivity; night driving difficulty was best related to visual acuity. Conclusion: Straylight is found to have added value for visual function assessment in drivers, whereas if visual acuity is known contrast sensitivity has limited added value.  相似文献   

17.
PURPOSE: To measure the effect of cataract type, severity and location on presenting, and best-corrected visual acuity, contrast sensitivity, and glare disability. METHODS: In all, 3654 (82.4% participation rate) eligible noninstitutionalised residents aged 49 years or older, living in two postcode areas of the Blue Mountains, Australia, received detailed eye examinations including visual acuity, contrast sensitivity, and glare disability testing. Data from right eyes were analysed using multiple regression modelling. RESULTS: The effect of age on visual acuity and contrast sensitivity only became evident in persons aged at least 60 years. Cataract severity was inversely related to visual acuity and contrast sensitivity. Late posterior subcapsular cataract caused the greatest reduction in visual acuity. Early grade cataract caused significant reduction in contrast sensitivity at intermediate and high spatial frequencies, but late grade cataract reduced contrast sensitivity across all spatial frequencies. There was insufficient study power to detect consistent significant effect of cataract on glare disability tests or cortical cataract location on visual function. CONCLUSIONS: Age at least 60 years, cataract type, and cataract severity were principal determinants of visual acuity and contrast sensitivity in this study. Axial and superotemporally located cortical cataract had the greatest effect on visual function tests.  相似文献   

18.
Purpose: The present study examines the impact of cataract on visual disability (VD) and how cataract surgery alters VD. Methods: Fifty-six patients were assessed pre- and at 3 months post-cataract surgery. Cataract severity was measured with the Lens Opacities Classification System ill (LOCS III). Visual disability was assessed by questionnaire. The relationship between LOCS III scores and total VD score was examined with linear regression. Repeated measures analysis of variance was used to determine whether the pre- and postoperative VD scores were different. Results : The VD score was found to relate more closely to the LOCS III score in the least affected eye than in the most affected eye. The VD score is related to nuclear opacity (P=0.01), and posterior subcapsular cataract (PSC; P=0.0004), but not to cortical cataract (P=0.51) (r2= 0.43). The VD score is significantly greater before surgery (mean ±SD) 1.81 +0.67) than after (1.19 ± 0.21; P± 0.001). Conclusions: Nuclear and PSC cataracts cause more visual disability than cortical cataracts. Visual disability is significantly reduced by cataract surgery.  相似文献   

19.
PURPOSE: Quantify and localize lenticular forward scatter using Shack-Hartmann wavefront sensing (SHWS) as single-valued metrics and a scatter map, and to examine the relationships between forward scatter and backscatter metrics and visual acuity. METHODS: We obtained SHWS images from 148 patients in the Texas Investigation of Cataract Optics study. Patient age was 22 to 84 years, with Lens Opacities Classification System III (LOCS III) nuclear opalescence (NO) scores ranging from 0.8 to 5.6. Visual acuities were measured at photopic (280 cd/m2) high (VA(PHC)) and low contrast (VA(PLC)) and mesopic (0.75 cd/m2) high (VA(MHC)) and low contrast (VA(MLC)). Scattering was described in a scatter map and by five single-valued metrics characterizing SHWS lenslet point spread functions. The relationships between scatter and visual acuity were tested using linear regression. RESULTS: Visual acuities decreased proportional to both LOCS III NO (R2=up to 39%) and scatter metrics (R2=up to 21%). Stepwise multiple linear regression improved visual acuity prediction by including a backscatter and a forward scatter metric (R2 up to 51.2%). For the subjects over age 60 years (N=46, 68.8+/-6.12 years), the forward scatter metrics explain as much variance in visual acuities (R2=up to 29%) as LOCS III NO (R2=up to 26%). Combined they accounted for up to 48.8% of visual acuity variance. CONCLUSION: Forward light scatter can be quantified using SHWS and the resulting metrics explain significant variance in visual acuity, especially in the aging eye. Together with a backscatter metric they explain approximately 50% of the variance in VA.  相似文献   

20.
年龄相关性白内障早期视觉功能的临床评价   总被引:6,自引:0,他引:6  
Fu J  Wang J  Wang NL  Kang HJ 《中华眼科杂志》2006,42(3):236-240
目的探讨对比敏感度和眩光对比敏感度对白内障患者视觉功能评价的意义.方法使用自动眩光对比敏感度检查仪对最佳矫正视力≥0.5的年龄相关性白内障患者66例(115只眼)和健康人34例(34只眼)进行对比敏感度和眩光对比敏感度的检测.白内障患者中皮质性白内障31例(50只眼),核性白内障17例(32只眼),后囊膜下白内障18例(33只眼). 结果不同视力的白内障患者对比敏感度和眩光对比敏感度在低频段和中频段差异均有统计学意义(P<0.01),在高频段差异无统计学意义(P>0.05).皮质性白内障眼在对比敏感度的低和中频段,在眩光对比敏感度的低、中和高频段均低于健康眼,差异有统计学意义(P<0.01);核性白内障眼的对比敏感度和眩光对比敏感度在低频段低于健康眼,差异有统计学意义(P<0.01),眩光对比敏感度在中和高频段低于健康眼,差异有统计学意义(P<0.05);后囊膜下白内障眼的对比敏感度和眩光对比敏感度在低、中和高频段均低于健康眼,差异有统计学意义(P<0.01).最佳矫正视力≥0.8的57只白内障眼对比敏感度和眩光对比敏感度在各个频段均低于健康眼,对比敏感度在低频段,眩光对比敏感度在高频段差异有统计学意义(P<0.05);眩光对比敏感度在低频段差异有统计学意义(P<0.01);余频段的对比敏感度和眩光对比敏感度的差异无统计学意义(P>0.05).白内障眼的眩光对比敏感度比对比敏感度下降明显,在6.3°、4.0°、2.5°、1.6°、1.0°视角两者之间差异有统计学意义(P<0.01),在0.7°视角差异无统计学意义(P>0.05). 结论对比敏感度和眩光对比敏感度的测定可以为早期年龄相关性白内障患者的视觉功能评价提供灵敏、全面的客观依据.(中华眼科杂志,2006,42236-240)  相似文献   

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