准分子激光散光性角膜切削术治疗复合性近视散光

目的 探讨准分子激光散光性角膜切削术（ｐｈｏｔｏａｓｔｉｇｍａｔｉｃ ｒｅｆｒａｃｔｉｖｅ ｋｅｒａｔｅｃｔｏｍｙ,ＰＡＲＫ）矫治复性近视散光的有效性、准确性和预测性。方法 采用Ｃｏｍｍｐａｋ－２００型准分子激光机,对３４例４６眼复性近视散光行角膜椭圆形切削,根据散光度大小分为２组;Ａ组（－１．７５～－２．７５Ｄ）,Ｂ组（－３．００～－５．２５Ｄ）,并随访０．５ａ以上,观察手术前后的视力、屈光度、     

准分子激光屈光性角膜切削术治疗近视及近视散光度临床分析

目的 评价准分子激光性角膜切削术治疗近视及近视散光的临床效果。方法 应用准分子激光（ＮＩＤＥＫ ＥＣ－５０００型）治疗２４Ｄ以下，伴呈不伴５Ｄ以内散光的近视眼。２１４只治疗眼随诊６个月以上。结果 随诊１年以上的病例显示术后３个月敢光度及视力基本稳定。术后６个月时，在等值球镜度低于６Ｄ的治疗眼中，裸眼视力≥１．０者占９２．０４％，≥０．５为１００％，８０．５３％４ 裸眼视力≥术前最佳矫正视力，９９．     

准分子激光角膜切削术治疗近视和近视散光的临床研究

目的 评价准分子激光角膜切削术矫正近视的结果。方法 我院自１９９６年９月到１９９７年１０月,应用ＳＶＳＡＰＥＸ型（Ｓｕｍｍｉｔ Ｔｅｃｈｎｏｌｏｇｙ Ｉｎｃ．ＵＳＡ）准分子激光治疗仪,对１６８例近视患者（３１６只眼）行ＰＲＫ手术,对其中的１５０例（２６０只眼,占８４％）患者随诊至少３ｍｏ以上,最长１ａ;男６８例（１１６只眼,占４０．１％）,女８２例（１４４只眼,占５９．９％）。１５０例（２６０只眼     

准分子激光角膜切削术治疗近视和近视散光的临床观察

观察准分子激光角膜切削术治疗近视和近用光的临床结果。方法３０７例５５８只眼按术前散光度数分４组,Ⅰ组：１６８只眼,无散光;Ⅱ组：２６８只眼,散光－０．２５－－１．００Ｄ;Ⅲ组：８７只眼,散光－１．２５－－２．００Ｄ;Ⅳ组：３５只眼,散光－２．２５－－４．２５Ｄ。全部病例术后随访６个月以上。     

准分子激光屈光性角膜切削术治疗近视及近视散光临床分析

目的评价准分子激光屈光性角膜切削术治疗近视及近视散光的临床效果。方法应用准分子激光（NIDEKEC—5000型）治疗24D以下．伴或不件5D以内散光的近视眼。214只治疗眼随诊6个月以上。结果随诊1年以上的病例显示术后3个月屈光度及视力基本稳定。术后6个月时，在等值球镜度低于6D的治疗眼中，裸眼视力≥1．0者占92．04％，≥0．5为100％，80．53％的裸眼视力≥术前最佳矫正视力，99．12％的眼屈光度在预定矫正度数的±1．00D以内。低于10D的高度近视眼也有近似的疗效。214只治疗眼中操眼视力≥1．0者占78．97％，≥0．5为90．65％，72．43％的裸眼视力≥术前最佳矫正视力，88．32％的眼屈光度在预定矫正度数的±1．00D以内。6只眼（2．80％）最佳矫正视力减少2行以上，有Ⅱ级以上Haze的有7眼间（3．27％）。结论准分子激光屈光性角膜切削术治疗近视及近视散光具有很高程度的精确性和安全性，在＜10D的近视眼中更显示了良好的预测性和稳定性。     

准分子激光屈光性角膜切削术治疗近视和近视散光一年临床…

采用ＶＩＳ×２０／２０型准分子激光仪对１６９例（２８１眼）近视患者进行屈光性角膜切削术（ＰＲＫ）。术前等值球镜屈光度为－１．７５－１６．００Ｄ（－８．１９Ｄ±１．５２Ｄ）分为两组：Ｉ组：－１．７５－－６．００Ｄ，１５３眼，ＩＩ组：－６．２５－－１６．００Ｄ，１２８眼，随访一年以上，术后１年实际矫正屈光度在预测矫正度±１．００Ｄ者在Ⅰ，Ⅱ，组分别为８７．６％，５４．７％，裸眼视力≥０．５，１．０者在     

准分子激光屈光性角膜切削术治疗近视的临床分析

目的：评价准分子激光屈光性角膜切削术（PRK）治疗不同程度近视的疗效。方法：应用SchwindKeratomF准分子激光机对1995眼不同程度近视（－0．75～15．50D）行PRK治疗。按屈光度分三组：组Ⅰ≤－6．00D,873眼;组Ⅱ－6.25D—－10．00D,774眼;组Ⅲ＞－10．00D,348眼。术后12个月,对三组术后的视力、屈光度及Haze进行随访比较。结果：术后12个月Ⅰ、Ⅱ、Ⅲ组裸眼视力≥0．5者分别为986%,94．2％和60.04％;≥1.0者分别为85．5％,71.3％和25.9％;屈光度在±1．00D以内分别为90．5％,68．8％和29．3％。角膜雾状混浊（Haze）≥2级者分别为0.8％,11．5％和13．7％。结论：PRK治疗中低度近视疗效较好,对高度和超高度近视由于术后Haze和屈光度回退发生率增高,疗效受到明显影响,有待进一步完善手术方法和术后用药等问题。     

准分子激光屈光性角膜切削术治疗近视和近视散光一年临床观察

采用ＶＩＳ×２０／２０型准分子激光仪对１６９例（２８１眼）近视患者进行屈光性角膜切削术（ＰＲＫ）。术前等值球镜屈光度为－１．７５—１６．００Ｄ（－８．１９Ｄ±１．５２Ｄ）。分为两组：Ⅰ组：－１．７５—－６．００Ｄ，１５３眼：Ⅱ组：－６．２５—－１６．００Ｄ，１２８眼。随防一年以上。术后１年实际矫正屈光度在预测矫正度±１．００Ｄ者在Ⅰ、Ⅱ组分别为８７．６％，５４．７％，裸眼视力≥０．５，１．０者在Ⅰ组分别为９７．４％，７４．５％，Ⅱ组分别为８６．７％，３５．９％。并发症主要有角膜上皮下雾状混浊（Ｈａｚｅ），其中Ⅱ组有９．５％的术眼发生了２—３级的Ｈａｚｅ。全组１．９％术眼发生了激素性高眼压     

准分子激光屈光性角膜切削术治疗近视,近视散光2年结果分析

为了评价准分子激光屈光性角膜切削术治疗近视、近视散光的疗效。应用美国ＶＩＳＸ２０／２０型准分子激光仪,采用多削区治疗近视屈光度为－１．７５～－１６．００Ｄ的患者,观察２年以上,按术前球镜屈光度分为二组,Ⅰ组为－１．７５～６．００Ｄ（１２１眼）,Ⅱ组为－６．２５～－１６．００Ｄ（８６眼）。术后２年裸眼视力≥０．５者在Ⅰ、Ⅱ组中分别为９５．９％、７０．９％,≥１．０者分别为７３．６％、３４．９％。Ⅰ、Ⅱ组中屈光度在±１．００Ｄ以内者分别为９１．７％、６２．８％。角膜上皮下混浊０度在Ⅰ、Ⅱ组中分别为８７．６％、６６．３％,２级以上分别为０、１．２％。眼压均正常。结论：准分子激光屈光性角膜切削术对低、中、高度近视、近视散光均取得良好的远期效果,但对低、中度近视效果更佳,对高度近视预测性较差。     

PRK治疗复性近视散光效果分析

目的探讨PRK治疗复性近视散光的临床疗效.方法按术前欲矫正球镜屈光度将88眼分为A(≤-6D,62眼)、B(≥-6.25D,26眼)两组,回顾性分析随访1年后的残留球镜度、散光度和非矫正视力情况.结果术后B组球镜度仍高于A组(-0.83D和-0.44D,P=0.0005).两组除术后3个月时,手术前后散光度均无明显差别(P>0.05).两组间非矫正视力在整个随访期间差别均有非常显著性意义(P<0.01).结论由于对高度近视矫正得不够彻底,PRK仅对球镜度低于-6D以下的复性近视散光疗效确切.     

Analysis of photoastigmatic keratectomy with the cross-cylinder ablation

Aim:

The aim was to evaluate the safety and efficacy of the “cross-cylinder” technique in the correction of astigmatism.

Setting and Design:

A prospective interventional study from a university eye department was conducted.

Material and Methods:

The photoastigmatic refractive keratectomy (PARK) using the “cross-cylinder” technique was performed in 102 eyes of 84 patients with at least 0.75 D of astigmatism. The study population was divided into two groups: in the first group the preoperative astigmatic power ranged from –0.75 D to –3.00 D (group 1), in the second group it ranged from –3.25 D to –6.00 D (group 2). Group 1 included 82 eyes of 67 patients (29 males and 38 females) with a mean cylinder power of –1.90 ± 0.63 D, group 2 included 20 eyes of 17 patients (13 males and 4 females) with a mean cylinder power of -4.28 ± 0.76 D. All eyes were targeted for emmetropia. The results were evaluated using Calossi''s vector analysis method. Six-month postoperative outcomes are presented.

Results:

Six months after PARK the mean sphere for the entire cohort was +0.28 ± 0.75 D (range +2.5 to –2 D), the mean cylindrical power was +0.33 ± 0.51 D (range +2.5 to –1.25 D) and the mean spherical equivalent refraction was +0.73 ± 0.81 D (range +1.75 to –2 D).

Conclusions:

The cross-cylinder technique may be safely used with predictable results for the correction of astigmatism.     

Excimer laser surgery for myopia and myopic astigmatism

Photorefractive keratectomy using the Summit Excimer Laser has been carried out on 1333 eyes with myopia or myopic astigmatism which have been followed up for six months or longer. Of those, 607 have been followed up for one year.
Of the eyes with myopia or myopic astigmatism of up to 3 dioptres spherical equivalent, at one year 85.6% had unaided vision of 6/6, 97.2% 6/9 or better, and 99.4% 6/12 or better. Of the eyes between -3.25 and -6.00 dioptres spherical equivalent, at one year 72.1% achieved 6/6 vision unaided, 88.8% 619 or better, and 94.2% 6112 or better. Of the eyes between -6.25 and -10.00 dioptres, at one year 49.6% achieved 616 vision unaided, 76.1% 619 or better and 88.0% 6/12 or better.
To achieve these figures, 28% of the patients had astigmatic keratotomy, either two or three weeks before photorefractive keratectomy, or at the same time as photorefractive keratectomy. Photorefractive keratectomy is as predictable as radial keratotomy in eyes of under 6 dioptres myopia, but is more predictable than radial keratotomy in higher myopia. Photorefractive keratectomy has the advantages of leaving an eye which is structurally sound, and without diurnal variation of focusing.     

固体激光角膜切削术治疗近视散光的疗效观察

为评价固体激光角膜切削术治疗近视散光的疗效,采用ＬｉｇｈｔＢｌａｄｅ固体激光手术系统对４４例６０眼复性近视散光同时竟性进行近视和散光角膜切削术,随访６～１２个月,对手术前后屈光度变化,视力结果统计分析,并与同期手术的单纯近视进行比较。结果：６０眼平均球镜屈光度从－６．７４±２．１４（－０．７５－１６．００）Ｄ降到－０．１４７±０．２３（－０．２５－０．７５）Ｄ柱镜度从１．６２±０．５３（０．７５－４．７５）Ｄ降到０．０６４±０．２７（０－０．７５）Ｄ。裸眼视力０．５,５７眼９５％,裸视力１．０４者７眼７３．３３％。单纯近视术后裸视力０．５和１．０的分别是９４．２３％和７５％,复性近视散光和单纯近视的固体激光疗效无明显差别（Ｐ＞０．１）。结论：ＬｉｇｈｔＢｌａｄｅ固体激光手术系统治疗近视散光安全有效,预测性好。     

准分子激光角膜切削术治疗角膜表面镜片术后散光

评价准分子激光角膜切削术治疗角膜表面镜片术后散光的效果。采用Ｃｏｈｅｒｅｎｔ产ＳＣＨＷＩＮＤＫＥＲＡＴＯＭ准分子激光治疗系统对８例１２只眼角膜表面镜片术后散光进行治疗，均为圆锥角膜术后病例，术前柱镜屈光度为－１．７５—－１０．００Ｄ，平均－５．４９Ｄ±３．２１Ｄ。术后随访６—１５月，平均１１．８月，显示裸眼视力均明显提高，矫正视力与术前相比提高者７只眼（５８．３３％）。柱镜平均屈光度由－５．４９Ｄ下降至－２．７７Ｄ，均无明显术后痛疼，术后角膜雾状混浊均不显著。说明准分子激光角膜切削术可有效地治疗角膜表面镜片术后的角膜散光，能显著地提高角膜表面镜片术治疗圆锥角膜的最终效果。     

Photorefractive keratectomy in the correction of astigmatism using Schwind Amaris 750s laser

AIM:To evaluate the results of three photorefractive keratectomy (PRK) procedures in the treatment of astigmatism.METHODS:In thisretrospective comparative case series, 89 eyes of 50 patients who underwent PRK treatment for astigmatism were enrolled. The patients were divided into 3 groups based on the PRK procedure:Group 1:PRK without mitomycin-C (MMC) application, Group 2:PRK with MMC application, and Group 3:Trans-Photorefractive Keratectomy(T-PRK). The efficacy, safety, predictability, and complications of treatment were assessed at 1, 3 and 6 months after the treatment.RESULTS: At postoperative 6 months, the percentage of postoperative uncorrected visual acuity (UCVA) of 20/20 or better was 55.6% (20 eyes) in group 1, 75% (15 eyes) in group 2, and 75.8% (25 eyes) in group 3 (P=0.144).The percentage of postoperative best corrected visual acuity (BCVA) of unchanged or gained ≥1 lines was 80.6% (29 eyes) in group 1, 70% (14 eyes) in group 2, and 90.9% (30 eyes) in group 3 (P=0.151). The percentage of postoperative BCVA of lost ≥2 lines was 11.1% (4 eyes) in group 1, 20% (4 eyes) in group 2, and 6.1% (2 eyes) in group 3. The mean manifest refractivespherical equivalent (MRSE) and mean cylindrical refraction were not significantly different among the each groups (P>0.05). At postoperative 6 months, the percentage of MRSE of within ±0.50 D was 100% (36 eyes) in Group 1, 100% (20 eyes) in Group 2, and 93.9% (31 eyes) in Group 3. At the each follow-up period, there was no significant difference in number of eyes with haze and mean haze score(P>0.05).CONCLUSION:The study showed that PRK without MMC, PRK with MMC and T-PRK appears to have similar effectiveness, safety and predictability in the treatment of astigmatism. The incidence of haze was also similar between the three groups.     

准分子激光光学性柱镜矫治术治疗单纯性近视散光临床疗效分析

目的　评价准分子激光光学性柱镜矫治术 (photoastigm atic refractive keratectom y,PARK)治疗单纯近视性散光的疗效。方法　 7例 (9眼 )平均单纯近视性散光度为 - 2 .6 9± 1.0 4D,角膜散光 2 .5 0± 0 .72 D。实施PARK后随访 12～ 2 4个月。对术后视力、角膜表面形态及角膜散光的改变进行临床分析。结果　 9眼单纯近视性散光术后裸眼视力为 1.0 7± 0 .14,角膜散乐 1.16± 0 .0 9D。无角膜 Haze、“眩光”和上皮的并发症。结论　 PARK治疗单纯近视性散光安全、临床疗效好。     

Photorefractive keratectomy for compound myopic astigmatism

PURPOSE: To evaluate the safety and efficacy of photorefractive keratectomy for the treatment of primary compound myopic astigmatism. METHODS: In a prospective study, 93 eyes from 56 patients with a mean spherical equivalent of -4.98 +/- 1.80 diopters (range, -1.75 to -8.5) underwent photoastigmatic refractive keratectomy with the Summit Apex Plus excimer laser using erodible mask technology and were followed for 2 years. Primary outcome measures included an assessment of astigmatic correction through vector analysis, manifest refraction, uncorrected visual acuity, corneal clarity, and the presence of adverse symptoms.RESULTS: Eighty-five eyes (91.4%) were available for analysis at 6 months. Mean spherical equivalent refraction was reduced 85% (mean, -0.75 +/- 0.85 diopter) and the target-induced astigmatism was reduced 70% (mean, 0.98 +/- 1.88 diopters). Forty-eight eyes (56%) had an uncorrected visual acuity of 20/20 or greater, whereas 70 eyes (82%) had an uncorrected visual acuity of 20/40 or greater. Twenty-four eyes (26% ) required re-treatment because of undercorrection of the spherical equivalent and astigmatic components after the 6-month follow-up. Fifty-nine of the remaining eyes were available at the 24-month visit. Mean spherical equivalent refraction was reduced to -0.39 +/- 0.72 diopter (91.8%). The target-induced astigmatism was reduced 64% from 1.74 diopters. Forty-one eyes (81.3%) were within +/-1.0 diopter of attempted spherical equivalent correction. Stability within a spherical equivalent of +/-0.5 diopter occurred after the first postoperative month. Fifty-six eyes (94.9%) had an uncorrected visual acuity of 20/40 or greater, whereas 34 eyes (57.6 %) demonstrated an uncorrected visual acuity of 20/20 or greater. One eye (1.7%) lost 2 or more lines of best spectacle-corrected visual acuity.CONCLUSION: Photoastigmatic refractive keratectomy with the Summit Apex Plus excimer laser is a safe and effective method of reducing compound myopic astigmatism. However, higher re-treatment rates may result from significant undercorrections because of current laser algorithms and variability in the mean angle of error.