非球面切削LASEK和LASIK治疗不同厚度角膜的高度近视

Objective To compare the clinical curative effect of corneal wavefront-guided combining Q-value guided aspheric keratctomy excimer LASEK for high myopia of thin cornea (<500μm) and corneal wavefront-guided combining Q-value guided LASIK for high myopia of thick cornea (>500μm). Methods Of selected 25 high myopia of thin cornea (42 eyes), and 38 high myopia of thick cornea (65 eyes), compared the preoperative uncorrected visual acuity (UCVA), age, corneal thickness, atherectomy thickness,remnant thickness, spherical equivalent (SE), Coma-like RMS (root of mean square), spherical-like RMS,RMSg (root of mean square of general aberration) with postoperative UCVA of 2, 4 weeks, 1 month, 3, 6 months SE, Coma-like RMS, spherical-like RMS, RMSg, Level of Haze. Results There were no statistically significant differences between two groups 6 months aiter operation in UCVA, spherical equivalent (SE),Coma-like RIMS, spherical-like RMS and RMSg. Both groups showed high safety, efficacy, predictability and the same clinical curative effect. Conclusions Aspheric keratectomy excimer LASEK for high myopia of thin cornea and corneal wavefront-guided combining Q-value guided LASIK for high myopia of thick cornea have the same clinical curative effect.     

江西近视手术人群角膜前表面非球性参数调查分析

Objective To assess the distribution features of Q-value of corneal anterior surface in Jiangxi myopia population for laser refractive surgery and to investigate the relationship between Q-value and other related parameters, such as spherical equivalent (SE), corneal curvature, cornea astigmatism, wavefront data and age. Methods The K&Q calculator of Orbsean- Ⅱ anterior segment system was used to obtain the Q-value of 6 mm optical zone in 411 cases (822 eyes) .There were 188 male subjects (376 eyes) and 223 female subjects (446 eyes). Accnrding to SE, subjects were divided into three groups including low myopia, moderate myopia and high myopia. According to different age, subjects were divided into three groups including group Ⅰ (age from 17 to 25), group Ⅱ (age from 26 to 34) and group Ⅲ (age from 35 to 44). Statistical analysis was used to comprehend the distribution characters of Q-value and its relations with SE, corneal curvature, cornea astigmatism, wavefront data and age. Results The Q-value of 822 eyes (411 cases) distributed as positive normal distribution, the average of Q- value was -0.148± 0.120 (range from -0.73 to 0.56) and -0.130± 0.128for male subjects and -0.163± 0.110 for female ones with statistically significant difference in Q-value in different genders (t=4.069, P <0.01). A significant difference was observed in Q-value among 17-25 years, 26-34 years and 35-44 years groups (F =4.567, P <0.05) as well as between 26-34 years group and 35-44 years group (P =0.004). However, there was no significant difference found between different myopic groups (F =1.434, P >0.05). The Q-value shown significantly negative relationship with C12, the Q-value show poor relationship with cornea curvature, cornea astigmatism, RMSh and C8. But the Q-value was not related with SE, RMSg, C7, cornea thickness, ocular pressure and age. Conclusions In Jiangxi myopia population for refractive surgery corneal curvature of majority population become flatter from center to periphery (Q<0), minority become steeper from center to periphery (Q>0). The Q-value of corneal anterior surface is independent from myopic SE. The Q-value show poor relationship with cornea curvature, cornea astigmatism, RMSh and C8, C12 is the most important related factor of Q-value. The Q-value is significantly greater in males than in females. A significant difference is observed in Q-value between 26-34 years and 35-44 years group.     

江西近视手术人群角膜前表面非球性参数调查分析

Objective To assess the distribution features of Q-value of corneal anterior surface in Jiangxi myopia population for laser refractive surgery and to investigate the relationship between Q-value and other related parameters, such as spherical equivalent (SE), corneal curvature, cornea astigmatism, wavefront data and age. Methods The K&Q calculator of Orbsean- Ⅱ anterior segment system was used to obtain the Q-value of 6 mm optical zone in 411 cases (822 eyes) .There were 188 male subjects (376 eyes) and 223 female subjects (446 eyes). Accnrding to SE, subjects were divided into three groups including low myopia, moderate myopia and high myopia. According to different age, subjects were divided into three groups including group Ⅰ (age from 17 to 25), group Ⅱ (age from 26 to 34) and group Ⅲ (age from 35 to 44). Statistical analysis was used to comprehend the distribution characters of Q-value and its relations with SE, corneal curvature, cornea astigmatism, wavefront data and age. Results The Q-value of 822 eyes (411 cases) distributed as positive normal distribution, the average of Q- value was -0.148± 0.120 (range from -0.73 to 0.56) and -0.130± 0.128for male subjects and -0.163± 0.110 for female ones with statistically significant difference in Q-value in different genders (t=4.069, P <0.01). A significant difference was observed in Q-value among 17-25 years, 26-34 years and 35-44 years groups (F =4.567, P <0.05) as well as between 26-34 years group and 35-44 years group (P =0.004). However, there was no significant difference found between different myopic groups (F =1.434, P >0.05). The Q-value shown significantly negative relationship with C12, the Q-value show poor relationship with cornea curvature, cornea astigmatism, RMSh and C8. But the Q-value was not related with SE, RMSg, C7, cornea thickness, ocular pressure and age. Conclusions In Jiangxi myopia population for refractive surgery corneal curvature of majority population become flatter from center to periphery (Q<0), minority become steeper from center to periphery (Q>0). The Q-value of corneal anterior surface is independent from myopic SE. The Q-value show poor relationship with cornea curvature, cornea astigmatism, RMSh and C8, C12 is the most important related factor of Q-value. The Q-value is significantly greater in males than in females. A significant difference is observed in Q-value between 26-34 years and 35-44 years group.     

Characteristics of posterior corneal astigmatism and aberration in cataract patients with high myopia北大核心CSCD

Objective: This study was to investigate the characteristics of posterior corneal astigmatism (PCA) and aberration in cataract patients with high myopia. Methods: A retrospective study was designed. Two hundred and eighty-two eligible eyes of 190 cataract patients were enrolled in Eye and ENT Hospital of Fudan University from September to December, 2014.The eyes were classified into two groups according to axial length (AL): high myopia group with 139 eyes (AL≥26 mm) and control group with 143 eyes (AL was 20 to 25 mm). The mean keratometric mid-radius of curvature (Km), corneal central thickness (CCT), astigmatism and aberrations were measured by the rotating Scheimpflug System (Pentacam), and the AL were measured by the partial coherence interferometry (IOL Master). This study followed the Helsinki declaration, and was approved by the Ethic Committee of Eye and ENT Hospital, Fudan University. Informed consent was signed from each patient. Results: In high myopia group, the mean PCA was 0.3 D (range 0~0.9 D) and 92.8% eyes had PCA values <0.5 D. The steep corneal meridian was aligned vertically (60°~120°) in 87.1% eyes for the posterior corneal surface. There was no significant difference in PCA between the high myopia group and the control group (P=0.797). Significant positive linear correlations was found between PCA and anterior corneal astigmatism (ACA), PCA and anterior corneal root mean square (RMS), PCA and anterior lower-order RMS, PCA and posterior corneal RMS, PCA and posterior high-order RMS, PCA and posterior lower-order RMS (r=0.235, P=0.005; r=0.217, P=0.010; r=0.229, P=0.007; r=0.395, P=0.000; r=0.243, P=0.004; r=0.384, P=0.000). Compared with total corneal astigmatism (TCA), anterior corneal measurements overestimated with-the-rule astigmatism (WTR) by a mean of (0.27±0.18)D in 65.67% eyes, underestimated against-the-rule astigmatism (ATR) by (0.27±0.18)D in 88.10% eyes and underestimated oblique astigmatism (Obl) by (0.22±0.10)D in 63.33% eyes. Compared with total corneal aberrations, anterior corneal aberrations measurements overestimated by (0.275±0.176)μm in 87.05% eyes, and the anterior corneal astigmatism types had no effect on the result. Conclusions: In high myopia group, 92.8% eyes had PCA values <0.5 D and the main astigmatism type in posterior corneal surface was ATR. The posterior corneal astigmatism and aberration were needed to consider in choosing intraocular lens (IOL) before cataract surgery. Copyright © 2018 by the Chinese Medical Association.     

Comparison of Corneal Thickness of Young People with Middle and High Myopia between Shantou and Zhengzhou

 Purpose: To compare the corneal thickness of young subjects (aged 18 to 30 years) with moderate and high myopia living in Shantou and Zhengzhou. Methods: One hundred and forty myopic subjects from Shantou(Guangdong, southern China) and 101 from Zhengzhou (Henan, central China) were selected and divided into 2 groups (moderate-myopic group and high-myopic group). The participants were sex-and age-matched.The central corneal thickness (CCT) and thinnest corneal thickness(TCT) were measured by Orbscan and compared between the two groups. Results: In the high-myopic group, CCT (515.47±40.39 μm) and TCT(510.22±40.95 μm) of the Shantou subjects (mean spherical equivalent [SE] -7.56±1.35), were thinner than those of their Zhengzhou counterparts (mean SE -7.47±0.88). In the moderate-myopic group (Shantou mean SE -4.52±0.83; Zhengzhou -4.67± 0.77), CCT and TCT did not differ between the two cities. Conclusion: The corneal thickness of high-myopic eyes may differ between Shantou and Zhengzhou.     

Corneal Topography Research of Myopia in Chinese

Purpose: To determine corneal topography parameters of myopia in Chinese and help for studies of causes of myopia, distingiush other corneal diseases (such as early keratoconus), further explore the accurateness and safeness of the clinical effects of radii keratotomy(RK) or photorefractive keratectomy (PRK). Methods: Fifty-eight eyes with mild or moderate myopia were examined by computer-assisted photokeratography. (TMS-1 Computed Anatomy Inc. New York. NY)Results: The corneal topography of most (68%) of the examined eyes showed symmetric bowtie pattern; the corneal surface of most (75%) of the examined eyes showed positive aspheric shape (steeper centrally, flatter peripherally); the refractive power of central cornea is at mean 44. 165 ± 1. 429D; the refractive difference between 1 to 25 ring in keratoscpe was at mean 1. 655 ± 0. 785D; the mean SRI was 0. 558 ± 0. 768, the mean SAI was 0. 296 ± 0. 149; the mean Smik was 44. 209±1. 515D. The apex and visual axis were dislocation in all the cornea     

Time trends in myopia and high myopia prevalence in young university adults in China

AIM: To investigate time trends in myopia and high myopia prevalence over 6y among young university adults in China. METHODS: This is a 6-year series cross-sectional study from 2016 to 2021. Totally 4910 freshmen were enrolled and completed a questionnaire concerning age, gender, and disease history. Students with eye diseases were excluded after a detailed eye examination. The refractive status was measured by non-cycloplegic objective refraction and ocular parameters were measured by Lenstar 900. The examination followed the same protocol each year. Trends over time in myopia and high myopia prevalence, as well as ocular biometry parameters, were analyzed. RESULTS: From 2016 to 2021, the axial length (AL) and corneal radius (CR) increased significantly (P=0.002 for AL; P=0.04 for CR). However, the spherical equivalent (SE) and the ratio of axial length to the corneal radius (AL/CR) did not change significantly (P=0.59 for SE; P=0.24 for AL/CR). The frequency of AL ≥26.0 mm increased from 26.6% in 2016 to 29.3% in 2021 (P=0.05 for trend). The prevalence of myopia and high myopia did not change significantly in our study (P≥0.18). Compared to a similar cross-sectional study conducted 10 years ago, the prevalence of myopia decreased significantly (94.9% vs 91.8%, P<0.001). Whereas the prevalence of high myopia increased largely (18.12% vs 27.6%, P<0.001). CONCLUSION: The prevalence of high myopia increases in young university adults during 10y period. Myopia control should begin earlier in childhood. However, these interventions are still needed for high myopia even in young adulthood.     

Distribution and correlation of refractive parameters in children with different corneal curvatures in southeast China

AIM: To analyze the distribution of refractive status in school-age children with different corneal curvatures (CC) and the correlation between CC and refractive status. METHODS: A total of 2214 school-aged children of grade 4 in Hangzhou who were screened for school myopia were included. Uncorrected distance visual acuity (UCDVA), non-cycloplegic refraction, axial length (AL), horizontal and vertical corneal curvature (K1, K2) were measured and spherical equivalent (SE), corneal curvature radius (CCR) and axial length/corneal radius of curvature ratio (AL/CR) were calculated. UCDVA<5.0 and SE≤-0.50 D were classified as school-screening myopia. According to the different CCRs, the patients were divided into the lower corneal curvature (LCC) group (CCR≥7.92) and the higher corneal curvature (HCC) group (CCR<7.92). Each group was further divided into the normal AL subgroup and the long AL subgroup. The refractive parameters were compared to identify any differences between the two groups. RESULTS: Both SE and AL were greater in the LCC group (P=0.013, P<0.001). The prevalence of myopia was 38% in the LCC group and 44% in the HCC group (P<0.001). The proportion of children without screening myopia was higher in the LCC group (62%) than in the HCC group (56%). Among these children without screening myopia, the proportion of long AL in the LCC group (24%) was significantly higher than that in the HCC group (0.012%; P<0.001). The change of SE in the LCC group was less affected by the increase of AL than that in the HCC group. CONCLUSION: School-aged children in the LCC group have a lower incidence of screening myopia and longer AL. Low CC can mask SE reduction and AL growth to some extent, and the change of AL growth change more in children with low CC than high CC. Before the onset of myopia, its growth rate is even faster than that after the onset of myopia.     

Factors affecting single-step transepithelial photorefractive keratectomy outcome in the treatment of mild, moderate, and high myopia: a cohort study

AIM: To investigate the effect of preoperative factors on visual acuity, higher-order aberrations (HOAs), and index of success for spherical change (S.IOS) after transepithelial photorefractive keratectomy (t-PRK) for treating different grades of myopia. METHODS: This was a retrospective one-armed cohort study where patients with high, moderate, or mild myopia treated with single-step t-PRK using Amaris 500 Hz excimer laser were evaluated for visual acuity, refractive status, corneal topography, HOAs, S.IOS, and mean efficiency and safety index before and 6mo after surgery. RESULTS: A total of 154 eyes of 77 patients with mild (n=59), moderate (n=83), and high (n=12) myopia were reviewed. The efficiency and safety indices for vision recovery by single-step t-PRK were 98% and 100%, respectively. The achieved spherical equivalent (SE) was within 1 diopter (D) in 151 (98%) eyes. The median of the S.IOS was 1.18 [interquartile range (IQR) 1.0, 1.4]. The change in S.IOS was significantly correlated with age (P=0.007), 6.5 mm ablation zone (Mann-Whitney U test, P<0.01), and mild and moderate grade of myopia (Kruskal–Wallis test, P<0.001). Trefoil aberration, spherical aberration, and aberration coefficient types of HOA increased significantly (Wilcoxon test, P<0.001) 6mo post-surgery. There was a significant correlation between spherical aberration and aberration coefficient HOAs by myopia grades (P<0.05). CONCLUSION: Single-step t-PRK has promising short-term outcomes for refractive corrections and vision improvement to treat all three grades of myopia.     

Clinical Efficacy of Toric Orthokeratology in Myopic Adolescent with Moderate to High Astigmatism

Purpose:.To observe the efficacy of toric design orthokeratology.(ortho-k).for correcting myopia and astigmatism in myopic adolescents with moderate to high astigmatism.Methods:.This was a self-controlled clinical study..Twentyfour subjects(42 eyes).aged 9 to 16 years with myopia of 2.50-6.00 D complicated with rule astigmatism of 1.50-3.50 D were fitted with Lucid Night Toric Ortho-k Lenses(LUCID,KOREA)..The changes in uncorrected visual acuity(UCVA),spherical degree, refraction, axial length(AL),.and corneal status were assessed at baseline, 1 night, 1 week, 1 month, 3months, 6 months, and 1 year after the commencement of ortho-k lens wear.Results: The success rate of the first lens fit was 92.8%. The UCVA after ortho-k wearing was improved significantly compared to the baseline during each visit(all P<0.01), and became stable 1 month after ortho-k. The manifest myopia was significantly reduced from(-3.41±1.27) D to(-0.41±0.37) D by toric ortho-k and the degree of astigmatism from(-1.81±0.53)D to(-0.41±0.39) D after 1 month of lens wear(P<0.01).The mean AL was(24.47 ±0.91) mm at baseline, which did not significantly differ from(24.49 ±0.87) mm and(24.48 ±0.94) mm after 6 months and l year,.respectively,.of lens wear(both P >0.05)..Grade 1 corneal staining was observed at 1week(23.8%),.1 month(21.4%), and 1 year(16.7%) following lens wear, and was improved by lens cleaning,.discontinuing lens wear, and moistening the cornea with eye drops.No severe adverse events were reported.Conclusion: The toric ortho-k lens was effective and safe for correction of low to moderate myopia in children with moderate to high astigmatism..The lens also effectively controlled axial length elongation during 1 year of observation..However,the long-term efficacy remains to be elucidated.     

无痛准分子激光角膜上皮瓣下磨镶术的临床研究

目的探讨控制准分子激光上皮瓣下角膜磨镶术（LASEK）术后疼痛及炎症反应的方法,评价无痛LASEK的可能性。方法常规LASEK为2006年6月1日至2007年6月1日手术者;无痛LASEK为2008年6月1日至2009年6月1日手术者。应用了更为熟练而稳妥的操作,增加了术前、术中、术后非类固醇消炎药普拉洛芬滴眼液的应用等措施。两组各160例（320眼）,随访时间均为1a。观察两组畏光、流泪、异物感、疼痛以及裂隙灯显微镜观察的情况,各项指标得分相加后得到综合评分,比较两组在术后即刻、术后2d,术后6d,术后14d在综合评分差异。结果无痛LASEK组和常规LASEK组综合评分在术后即刻,术后2d差别有统计学意义。术后6d及14d差别无统计学意义。症状消失的天数差别有统计学意义。结论无痛性LASEK控制LASEK术后疼痛及炎症反应有效而安全。可以达到无痛LASEK的要求。     

高度近视准分子激光原位角膜磨镶术过矫再治疗

目的 观察高度近视眼准分子激光原位角膜磨镶术(laser in-situ keratomileusis,LASIK)后过矫的再治疗效果和安全性.方法 采用掀开角膜瓣后再次激光切削的方式治疗高度近视眼LASIK术后过矫的患者7例(13眼).分别在术前和术后1 d,1周,1、3、6个月检查患者视力和屈光度.结果 术后角膜瓣平整、复位良好.视力:术前及术后第1天、1周、3个月分别为1.02±0.25、0.95±0.26、0.98±0.25、1.03±0.26,差异无统计学意义(P>0.05).屈光度:术前(+2.75±0.75)DS,术后3个月(-0.37±0.50)DS;散光:术前(+1.05±0.35)DC,术后3个月(-0.50±0.37)DC,术后术前差异均有统计学意义(屈光度:t=12.48,P=0.000;散光:t=10.972 8 ,P=0.000).结论 掀开角膜瓣后再次激光切削治疗高度近视LASIK术后过矫安全有效,无明显并发症.     

LASEK治疗高度近视的适宜屈光度范围

目的 探讨准分子激光上皮瓣下角膜磨镶术治疗高度近视的适宜屈光度范围.方法 对55例(109只眼)高度近视患者行准分子激光上皮瓣下角膜磨镶术.按术前等值屈光度分为3组.术后随诊12个月.研究术后效果并加以比较.结果 术后第12个月裸眼视力达最佳矫正视力:Ⅰ组75.0%,Ⅱ组72.5%,Ⅲ组48.5%.第12个月屈光度≤±1.0D:Ⅰ组80.56%、Ⅱ组75.00%、Ⅲ组51.52%.术后屈光回退值Ⅲ组最大.以上各项Ⅰ组、Ⅱ组与Ⅲ组差异有统计学意义(P<0.01).Ⅰ、Ⅱ组haze发生少,程度轻,Ⅲ组haze较重.3组均无圆锥角膜发生,无严重术后眩光及夜间视力下降主诉.结论 LASEK术治疗-8.00～-12.00D近视疗效较好,治疗超过-12.00D的近视有发生较严重的屈光回退及haze等并发症的可能.     

超高度近视LASIK术后的屈光回退

目的探讨准分子激光原位角膜磨镶术(laser in situ keratomileusis,LASIK)矫正超高度近视的准确性、预测性、稳定性及有效性.方法 LASIK矫正超高度近视-10.1～-26.0 D,平均(-13.9±3.4)D 124例193眼,按术前预矫等值球镜分别观察术后1年的屈光度,术前最佳矫正视力及术后裸眼视力.结果术后1年屈光回退率与性别、年龄、切削方式无关(P＞0.05),而是随着术前预矫度数的增加而增加.术前预矫屈光度越高,屈光回退程度越明显.术后平均裸眼视力达0.6以上.结论超高度近视LASIK术后准确性、预测性及稳定性均较差,但由于其具有有效性,我们可以积极地为患者实施此项手术.     

LASIK治疗散光为主眼临床结果

目的:评价准分子激光原位角膜磨镶术(LASIK)治疗以散光为主眼的有效性。方法:分析LASIK技术(鹰视准分子激光系统和MORIAC-B微型角膜刀)治疗以散光为主眼(A组,28眼)和以近视为主眼(B组,30眼)的术后结果。术前、术后分别进行视力,主、客观验光,角膜地形图等检查。采用6mm光学区分区切削模式。结果:A组患者术前裸眼视力均在0.1以下,术后均在0.6以上。术后6mo视力在0.8以上和1.0以上者:A组分别为96%和93%,B组分别为100%和93%;A组术前散光度平均为-2.48±1.27(-1.50～-4.50)D,术后减少至-0.52±0.56(-0.00～-1.00)D。B组术前散光平均为-0.72±0.63(-0.25～-1.25)D,术后减少至-0.38±0.32(-0.00～-0.50)D。A组和B组术前散光值比较相差显著(P<0.01),术后散光值比较无显著差别(P>0.05)。两组术后散光值均较术前有明显减小(P<0.01)。术后两组中散光在0.50D以内眼所占比例分别为86%和87%,最佳矫正视力提高1行的分别占36%和10%,没有1眼的最佳矫正视力下降2行以上。结论:采用鹰视准分子激光系统行LASIK治疗以散光为主眼具有很好的预测性,视觉矫治效果良好。     

LASIK后角膜瓣皱褶和折叠的处理

目的 探讨准分子激光原位角膜磨镶术(laser in situ keratomileusis,LASIK)后早期角膜瓣皱褶和折叠的有效处理方法.方法 对LASIK术后11例角膜瓣皱褶的原因及处理进行回顾性分析.所有的患者需经手术重新复位,在显微镜下采用去离子水冲洗角膜瓣加戴角膜接触镜24 h.术后观察角膜瓣状况、屈光变化、裸眼视力和最佳矫正视力.结果 经过处理的所有患者裸眼视力均达到或超过术前最佳矫正视力.角膜透明,未见明显皱褶,角膜瓣位置正常,无上皮植入.结论 角膜瓣皱褶和折叠是LASIK术后较严重的并发症.早期诊断和正确快速的处理是获得最佳视力的关键.用去离子水重新复位角膜瓣并佩戴角膜接触镜治疗LASIK术后早期角膜瓣皱褶和折叠是安全简单有效的方法.     

不同准分子激光模式原位角膜磨镶术后角膜Q值变化分析

目的评价准分子原位角膜磨镶术（LASIK）前后，两组不同切削模式对Q值的影响。方法应用美国雷赛LSX准分子激光机（5．3版）进行LASIK手术，比较常规切削模式组和椭球切削模式组手术前后Astramax角膜地形图测得Q值（4．5mm）的变化，随访时间12个月。结果所有术眼术中术后未见威胁视力的并发症发生。两组在术后裸眼视力、术后平均等效球镜的差异上元显著性，但是椭球切削模式组术后Q值显著性低于常规切削模式组。结论应用美国雷赛SLX型（5．3版）激光机，AstraPro Planner 2．2 P个体化软件的椭球切削模式，进行LASIK个体化切削术治疗近视安全、疗效确切、稳定，术后较球型切削模式Q值显著性减少，效果满意。     

高度近视眼行准分子激光非球面切削的临床观察

目的观察高度近视眼行准分子激光非球面切削与普通球面切削的视力、Q值和像差差异，探讨非球面切削对提高视觉质量的作用。方法高度近视眼病例56例（112眼）分为两组，分别行非球面切削（52眼）与普通球面切削（60眼），对两组术后10d，1、3、6个月的视力、Q值以及术后6个月的像差变化进行分析。结果两组术后各时期裸眼视力均可达到术前最佳矫正视力（P〉0．05），普通球面切削组术后各时期Q值均较术前显著增加（P〈0．01），非球面切削组术后10d、1个月Q值较术前显著增加（P〈0．01），3个月、6个月Q值较术前增加（P〈0．05），两组各时期Q值差异有统计学意义（P〈0．05），术后6个月两组的球差均较术前增加，而球面切削组像差增加又明显高于非球面切削组（P〈0．05）。结论使用非球面切削在一定程度上可以解决准分子激光原位角膜磨镶术（LASIK）术后高阶像差增加的问题，对提高术后视觉质量有一定意义。     

准分子激光原位角膜磨镶术治疗高度近视眼的远期疗效分析

目的评价准分子激光原位角膜磨镶术（LASIK）治疗高度近视眼的远期疗效。方法回顾性分析46例（92只眼）接受LASIK治疗的高度近视眼患者术前、术后1年和6年的裸眼视力、屈光度、回退发生率及夜间视觉症状等情况。结果术后1年和6年平均裸眼视力显著提高（4．65±0．23）vs．（3．21±0．28）,（4．59±0．20） vs．（3．21±0．28）,P ＜0．01;（4．65±0．23）vs．（4．59±0．20）,P ＞0．05;术后1年和6年平均屈光度显著降低（－2．43±0．26）D vs．（－9．42±3．36）D,（－2．51±0．31 D）vs．（－9．42±3．36 D）,P ＜0．01;（－2．43±0．26）D vs．（－2．51±0．31D）,P ＞0．05;术后6年回退发生率14．13％较术后1年有升高趋势10．87％,但未见统计学差异（P ＞0．05）,且均与预矫屈光度呈显著相关r 1＝0．97;r 6＝0．99;术后夜间不适症状与预矫屈光度相关（r 1＝0.47;r 6＝0．59）;≥－8．0 D 的患者术后主诉夜间不适比率明显高于≤－8．0 D 的患者（P ＜0．01）。结论LASIK治疗高度近视远期疗效稳定;但随屈光度增加术后稳定性及夜间视觉质量有下降趋势,建议超高度近视眼患者慎重选择。