Effect of mitomycin C on the corneal endothelial cells of Saudi patients with myopia after transepithelial photorefractive keratectomy:a two-armed cohort study

AIM:To study the effect of mitomycin C(MMC)applied during transepithelial photorefractive keratectomy(TPRK)on the corneal endothelium one week(W1)and three months(M3)after surgery and its determinants.METHODS:In this two-armed cohort study conducted in 2022,eyes treated with MMC during TPRK(group 1)were compared with eyes not treated with MMC(group 2).The corneal endothelial cell(EC)count,EC density(ECD;cells/mm2),average(μm2),standard deviation(μm2),coefficient of variation(CV%),ECmax,ECmin,and EC percentage of hexagonality were estimated at W1 and M3.The postoperative changes in the EC count in the two groups were compared and correlated with the other independent variables.RESULTS:Group 1 had 26 eyes,and group 2 had 78 eyes.All TPRK indices were significantly higher for the eyes in group 1 than for those in group 2.The MMC usage was not a significant predictor of the change in ECD(P=0.644),change in CV(P=0.374),and change in the percentage of hexagonality of EC(P=0.164)at W1.However,the use of MMC was a significant predictor of changes in CV(P=0.014)and the change in the percentage of hexagonality of EC(P=0.039)at M3.The duration of laser exposure and the size of the optical zone influenced the correlation of MMC use with the changes in EC indices,postoperatively.CONCLUSION:The use of MMC doesn’t affect ECD,CV,and percentage of hexagonality at W1 if other surgical indices are considered.At M3 after operating myopic eyes by TPRK,MMC significantly influence the CV and percentage of hexagonality.The duration of the laser application and the size of the optical zone should be considered when determining the effect of MMC on the EC indices.

A 3-month comparison study of subjective and objective visual quality of small incision lenticule extraction and transepithelial photorefractive keratectomy in patients with low and moderate myopia

AIM:To compare the subjective and objective visual quality between small incision lenticule extraction(SMILE)and transepithelial photorefractive keratectomy(t PRK)in patients with low and moderate myopia.METHODS:Patients undertaking SMILE or t PRK for the correction of low and moderate myopia were consecutively recruited in this prospective cohort study with a 3-month follow-up period.Objective evaluation[visual acuity test,manifest refraction,wavefront aberrations,the total cut-off value of the total modulation transfer function(MTFcut-off),and Strehl ratio(SR)]and subjective evaluation of visual quality(quality-of-life questionnaire)were conducted before surgery and at days 1,7,30,and 90 after surgery.RESULTS:A total of 47 patients(94 eyes)with SMILE and 22 patients(22 eyes)with t PRK were enrolled.The uncorrected visual acuity(UCVA)was better in SMILE patients on day 7 after surgery(1.13±0.13 vs 0.99±0.17,t=4.85,P<0.001)but was comparable at days 30 and 90.At day 90,the SMILE group had a lower spherical equivalent(SE)than the t PRK group(0.04±0.31 vs 0.19±0.43,t=2.08,P=0.042).Total higher order aberrations(HOAs)were induced in both surgical types,which were more evident in the t PRK group with 3-mm pupil diameter(0.16±0.07 vs0.11±0.05,t=4.27,P<0.001)and 5-mm pupil diameter(0.39±0.17 vs 0.36±0.11,t=2.33,P=0.022).The MTFcut-offand SR showed a trend of improvement in both SMILE and t PRK patients but were statistically better in the SMILE group with both pupil diameters.There was a significant improvement of contrast sensitivity(CS)over baseline levels at the spatial frequency of 18 cycles/degree(c/d)in the SMILE group(F=2.72,P=0.033)and at 3 c/d(F=3.03,P=0.031),12 c/d(F=3.72,P=0.013),and 18 c/d(F=4.62,P=0.004)in the t PRK group.The subjective quality of life questionnaire showed a steady improvement in the SMILE group(F=8.31,P<0.001)but not the t PRK group.CONCLUSION:SMILE and t PRK are both safe and effective ways to correct low and moderate myopia.A generally better and quicker recovery of visual quality favors the application of SMILE in qualified patients.

Transpalpebral intraocular pressure measurement by Diaton compared to Goldman applanation tonometer in myopic eyes before and after transepithelial photorefractive keratectomy in Saudi Arabia

AIM:To compare intraocular pressure(IOP)measured via the trans palpebral IOP(tp IOP)method using a Diaton or with a Goldman applanation tonometer(GAT)and study the determinants of IOP difference in eyes undergoing transepithelial photorefractive keratectomy(TPRK)for myopia.METHODS:This cross-sectional validation study was held in 2020 in an eye hospital in Saudi Arabia.IOP was measured by Diaton and GAT before treatment,after one week,and one month of TPRK.It is considered if IOP difference by Diaton and GAT was less than±2 mm Hg acceptable.The IOP difference was tested if correlated to spherical equivalent(SE),central corneal thickness(CCT),age,gender,or tp IOP.RESULTS:Totolly 200 myopic eyes of 100 patients were included in the study.The mean difference of IOP measured by two methods before TPRK,1wk,and 1mo after TPRK were 0.790,-0.790,and-0.920 mm Hg,respectively(P<0.001).Diaton could measure IOP effectively 89.5%eyes before TPRK and 82%and 84%at 1wk and 1mo after TPTK,respectively.At week 1,IOP differences were significantly correlated to baseline CCT(P=0.02)and tp IOP at week 1(P<0.001).One month after TPRK,only tp IOP was significantly correlated to the difference in IOP(P<0.001).CONCLUSION:Diaton is a good screening tool for IOP before TPRK.It helps in monitoring IOP after surgery.Although more practical,it is less efficient than GAT.In eyes with high myopia and low tp IOP before surgery,IOP post-TPRK by Diaton and GAT could differ.

SPT辅助的TPRK术后角膜上皮厚度和光密度的变化及两者的相关性

目的:观察智能脉冲技术(SPT)辅助的经上皮准分子激光角膜切削术(TPRK)术后角膜上皮厚度(CET)和光密度(CD)变化,并分析两者的相关性。方法:前瞻性研究。选取2023-02/08在新乡医学院第一附属医院眼科行SPT-TPRK手术治疗的近视及近视散光患者60例120眼,评估术前、术后1 wk,1、3 mo CET与CD的变化。结果:纳入患者失访14例28眼,术后出现haze 3例6眼,均剔除本研究,最终纳入患者43例86眼。术后1 wk,CET高于术前(P<0.05),角膜中央0-2 mm区域CET明显增厚(P<0.05);术后1 mo,角膜中央0-2 mm区域CET明显变薄(P<0.05);术后3 mo,角膜中央0-2 mm区域CET基本达术前水平。术后CD值升高,术后3 mo,0-2 mm区域CET与0-2 mm区域全层CD值呈正相关(r=0.256,P<0.05),2-5 mm区域CET与2-6 mm区域前层CD值呈正相关(r=0.319,P<0.05)。结论:角膜中央2 mm以内区域角膜上皮重塑需要3 mo时间;CET较薄的区域,术后角膜上皮重塑更快,术后早期增厚更多;术后早期CD值较术前均增加,且部分区域CET与CD值呈正相关。

Transepithelial photorefractive keratectomy mode using SCHWIND-ESIRIS excimer laser:initial clinical results

AIM: To evaluate postoperative pain, uncorrected visual acuity (UCVA), and cornea haze value after transepithelial photorefractive keratectomy (T-PRK) performed with aspherical ablation profile using SCHWIND ESIRIS excimer laser. METHODS: Retrospective case series. Fifty-nine eyes (32 patients) with myopia associated with or without astigmatism underwent phototherapeutic keratectomy (PTK) followed by photorefractive keratectomy (PRK) which performed by Optimized Refractive Keratecomy (ORK)-CAM software based on aspherical ablation profile using SCHWIND ESIRIS excimer laser. Postoperative pain scale was measured on a questionnaire through five levels. Haze was graded by five grades, and UCVA, manifest refraction spherical equivalent (MRSE) were analyzed. RESULTS: Mean pain level was (1.37 +/- 0.613) (range: 1 to 3), the mean time picking out the soft contact lens was (6.22 +/- 1.73) days, at 3 months, UCVA was 1.0 for 40 eyes (67.8%), 0.5 for all eyes (100.0%). The UCVA was significantly less than the preoperative best spectacle corrected visual acuity (BSCVA) (t=-2.84, P=0.006), haze value was (0.27 +/- 0.25), no patients had a haze grade up to 2. Mean MRSE was (0.76 +/- 0.96) diopter(D) by 3 months. CONCLUSION: The outcomes from this study show that using the SCHWIND ESIRIS aspherical ablation profile for transepithelial PRK has a good visual result. The primary advantage is related to a spherical ablation profile, automatically considers the ablation volume of the stroma and the accurate and smooth removal of the epithelium with PTK. Additional studies are needed to determine long-term outcomes.

Clinical outcomes of transepithelial photorefractive keratectomy versus femtosecond laser assisted keratomileusis for correction of high myopia in South Egyptian population

AIM: To evaluate the safety and efficacy of transepithelial photorefractive keratectomy(t-PRK) with adjuvant mitomycin C(MMC) versus femtosecond laser assisted keratomileusis(Femto-LASIK) in correction of high myopia.METHODS: Prospective randomized comparative study including 156 eyes of 156 patients with high myopia and a spherical equivalent refraction(SER) <-6.00 D. They were divided randomly into two groups: Group A included 72 eyes treated with t-PRK with adjuvant MMC and Group B included 84 eyes treated with Femto-LASIK. Visual acuity, SER, corneal topography, pachymetry and keratometry were assessed for 12 mo postoperatively.RESULTS: The preoperative mean SER was-8.86±1.81 and-9.25±1.70 D in t-PRK MMC group and Femto-LASIK respectively(P=0.99) which improved to-0.65±0.43 D and-0.69±0.50 D at 12 mo follow up. Mean SER remained stable during the 12 mo of follow-up, with no statistically significant difference between the two groups(P=0.64). In t-PRK MMC group, only six eyes needed retreatment after six months of follow up. And two eyes showed haze(one reversible haze grade 2, while the other had dense irreversible haze grade 4).CONCLUSION: t-PRK MMC provides safe and satisfactory visual outcomes and acceptable risk as Femto-LASIK in patients with high myopia.

Comparison of Postoperative Pain Following Laser-assisted Subepithelial Keratectomy and Transepithelial Photorefractive Keratectomy:a Prospective,Random Paired Bilateral Eye Study

Purpose:To compare postoperative pain following laser-assisted subepithelial keratectomy(LASEK) and transepithelial photorefractive keratectomy(T-PRK, two-step surgery) and alleviate postoperative subjective pain.Methods:.Thirty patients(60 eyes) with myopia or myopic astigmatism were consecutively recruited into this prospective,randomized paired study..Patients underwent LASEK in one eye,and T-PRK in the other. The degree of pain was rated on a scale of 0-10 on postoperative days 1,2 and 3..Uncorrected visual acuity(UCVA) and subepithelial corneal haze were assessed at postoperative 1 and 3 months.Results:.The pain was relieved on the 4th postoperative day in all patients,.healing of corneal epithelium was observed at4-5 days after surgery and contact lenses were removed promptly.At postoperative 1 day,.the mean subjective pain score in the LASEK group was 3.2±1.88 and 4.43±1.61 in TPRK group(P=0.008).No significant difference was found between two groups on postoperative 2 and 3 days. At postoperative 3 months, the percentage of UCVA ≥0.8 in the LASEK group was 100% and 96.7% in the T-PRK group.(P =0.24),93.3% of patients in the LASEK with UCVA ≥1.0 and 90%in the T-PRK group(P=0.64). In the LASEK group, the value of corneal haze was 0.26 ±0.21 and 0.27 ±0.25 in the T-PRK group(P=0.877).Conclusion:.Good visual acuity was obtained in both groups at postoperative 3 months. Compared with those in the T-PRKgroup, patients undergoing had less discomfort in the LASEK group, which may be associated with corneal epithelial activity. The changing curve of subjective pain in the T-PRK group was relatively flat and stable at postoperative 3 days.

Single-step transepithelial photorefractive keratectomy in high myopia：qualitative and quantitative visual functions

AIM：To investigate quantitative and qualitative optical outcomes of single-step transepithelial photorefractive keratectomy（Trans PRK）in high myopia.METHODS：In a prospective interventional case-series,30 eyes with high myopia（-6.00 to-8.75 D）with（up to-3.00 D）or without astigmatism were enrolled from Bina Eye Hospital,Tehran,Iran. One-step Trans PRK was performed with aberration-free aspherical optimized profile and SCHWIND AMARIS 500 laser. One-year follow-up results for refraction,visual acuities,vector analysis,ocular wavefront（OWF）and corneal wave-front（CWF）higher order aberrations（HOA）,contrast sensitivity（CS）,and postoperative haze were assessed.RESULTS：After the surgery,both photopic and mesopic CSs significantly improved（both P〈0.001）. We detected significant induction of OWF coma and trefoil（P〈0.001 for both）HOAs; CWF coma（P=0.002）,spherical（P〈0.001）,and tetrafoil（P=0.003）HOAs in 6 mm analysis diameter; and CWF trefoil（P=0.04）HOA in 4 mm analysis diameter. The range of mean induction observed for various HOAs was0.005-0.11 μm. The 86.7% of eyes reached an uncorrected distance visual acuity of 20/20 or better; 96.7% of eyes were within ±0.5 D of targeted spherical refraction. In vector analysis,mean correction index value was 1.03 and mean index of success was 0.22. By 12mo after the operation,no eye lost any number of corrected distancevisual acuity lines. We detected no corneal haze greater than 1~＋ throughout the follow-up.CONCLUSION：Our findings show promising effects of single-step Trans PRK on quality of vision in high myopic eyes. It also improves refraction and visual acuity.

Transepithelial photorefractive keratectomy for myopia:effect of age and keratometric values

AIM:To investigate demographic and preoperative factors increasing the risk of ametropia following transepithelial photorefractive keratectomy(trans PRK)in myopia and myopic astigmatism.METHODS:This retrospective cohort study included myopic eyes(-0.50 to-8.75 D)with or without astigmatism(up to 3.50 D)enrolled at Dr.Yap Eye Hospital Yogyakarta.Trans PRK was performed using Technolaz 217 z100 excimer laser.Subjects were clustered into ametropia and emmetropia group based on uncorrected distance visual acuities(UDVA)3 mo post-operatively.Multiple preoperative and intraoperative parameters were analyzed using Logistic regression to obtain their effect on ametropia risk following trans PRK.RESULTS:A total of 140 eyes of 87 consecutive subjects were studied.Prevalence of ametropia following trans PRK was 20(14.29%)eyes.Subjects in ametropia group were significantly older than the emmetropia group(31.80±14.23 vs 18.88±2.41,respectively;P<0.001).Bivariate Logistic regression analysis showed that older age(OR=1.23),higher preoperative spherical equivalent(>-6 D;OR=12.78),steeper anterior keratometric readings(Kmax>45 D and mean K>44 D;OR=4.28 and 4.35,respectively)increased the risk of ametropia following trans PRK.Adjusted multivariate Logistic regression analysis showed that age was the strongest predictor for the incidence of ametropia following trans PRK.Complications of trans PRK were overcorrection,suspected posterior keratoectasia and accommodation insuffiency.CONCLUSION:Older age can be the strongest factor for increasing ametropia risk following trans PRK.Cut-off points of Kmax and mean K at 45 and 44 D respectively are proposed as the predictors for ametropia following trans PRK.

LASEK和TransPRK及FS-LASIK术后角膜屈光力及视觉质量比较

目的:比较准分子激光上皮下角膜磨镶术(LASEK)、经上皮准分子激光角膜切削术(TransPRK)、飞秒激光制瓣的准分子激光原位角膜磨镶术(FS-LASIK)三种角膜屈光手术术后角膜屈光力及视觉质量。方法:回顾性研究。选取2021-01/2022-12在我院择期行角膜屈光手术的232例464眼患者作为研究对象,根据患者选择手术方式不同分为LASEK组70例140眼、TransPRK组76例152眼、FS-LASIK组86例172眼。比较三组患者术前,术后1、3 mo时裸眼视力(UCVA)、视觉质量、生物力学稳定性、泪膜破裂时间(BUT)、泪液分泌试验(SⅠt)及生活质量变化情况。结果:术后1、3 mo三组患者裸眼视力较术前均改善,全角膜总高阶像差、球差、水平彗差、垂直彗差均升高,生物学稳定性均降低(均P<0.05)。术后3 mo, TransPRK组、LASEK组生物学稳定性均高于FS-LASIK组(均P<0.05),TransPRK组生活质量评分较LASEK组及FS-LASIK组高(P<0.05)。手术前后三组患者BUT、SⅠt比较均无差异(均P>0.05)。结论:LASEK、TransPRK、FS-LASIK三种角膜屈光手术治疗屈光不正疗效确切,在改善裸眼视力和提高视觉质量方面结果相似,但TransPRK、LASEK较FS-LASIK具有更稳定的生物力学性能,且TransPRK组在改善患者生活质量方面具有更好的效果。

SMILE治疗近视患者效果及对角膜生物力学的影响

目的:探讨飞秒激光小切口角膜基质透镜取出术(SMILE)治疗近视患者的效果及对角膜生物力学的影响。方法:回顾性研究。选择2020-01/2021-12在安阳市眼科医院拟行角膜屈光手术的近视患者120例240眼。根据手术治疗方式分为SMILE组64例128眼,经上皮准分子激光角膜切削术(TransPRK)组56例112眼。比较两组患者术后1、7 d,1、3、6 mo,1 a的裸眼视力、角膜生物力学、角膜内皮细胞数目、角膜后表面高度、角膜表面规则指数、手术并发症。结果:SMILE组患者术后1、7 d,1 mo裸眼视力均优于TransPRK组(均P<0.001),但两组术后3、6 mo,1 a均无差异(均P>0.05)。与术前相比,两组患者术后的角膜补偿眼压、模拟Goldmann眼压、角膜阻力因子、角膜滞后量呈先下降后升高趋势。SMILE组术后1、7 d,1 mo角膜补偿眼压、模拟Goldmann眼压、角膜阻力因子、角膜滞后量均高于TransPRK组(均P<0.05),但术后3、6 mo,1 a均无差异(均P>0.05)。手术前后两组患者角膜内皮细胞数目、角膜后表面高度均无差异(均P>0.05)。与术前相比,两组患者术后角膜表面规则指数呈先升高后降低趋势,但组间比较无差异(P>0.05)。两组患者术后并发症发生率比较无差异(P>0.05)。结论:相比TransPRK,SMILE对角膜生物力学的影响较小,早期视力恢复效果更好,两种手术的远期视力无差异,均有良好的安全性和有效性。

Trans-PRK联合预防性快速CXL矫正薄角膜或角膜形态欠规则屈光不正的疗效及安全性

目的评估经上皮准分子激光屈光性角膜切削术(Trans-PRK)联合预防性快速角膜交联术(CXL)矫正薄角膜或角膜形态欠规则(除外圆锥角膜)屈光不正的疗效及安全性。方法采用系列病例观察研究方法,纳入2017年8月至2018年7月于包头朝聚眼科医院诊断为薄角膜或角膜形态欠规则并行Trans-PRK联合预防性CXL手术的近视患者55例55眼,所有患者均取右眼数据进行分析。术前、术后1周及术后1、3、6、12个月采用国际标准视力表检测术眼裸眼远视力(UDVA);采用电脑验光和综合验光检测屈光度。术前及术后3、6、12个月采用Pentacam眼前节分析仪检查角膜形态;术前及术后1、3、6、12个月采用非接触式眼压计测量眼压。记录术后并发症发生情况。结果术前、术后1周及术后1、3、6和12个月术眼UDVA(LogMAR视力)分别为0.52(0.55,0.78)、0.22(0.12,0.17)、0.10(0.04,0.07)、0.00(-0.04,-0.16)、-0.08(-0.05,-0.03)、-0.08(-0.06,-0.04),总体比较差异有统计学意义(Z=249.44,P<0.001),其中术后各时间点UDVA均较术前提高,术后3、6和12个月术眼UDVA较术后1周和1个月明显改善,差异均有统计学意义(均P<0.001)。术眼术后各时间点球镜度较术前均明显下降,术后1、3、6和12个月术眼球镜度低于术后1周,术后12个月术眼球镜度低于术后3和6个月,差异均有统计学意义(均P<0.001)。术后1、3、6和12个月术眼柱镜度低于术前和术后1周,差异均有统计学意义(均P<0.05)。术眼术后等效球镜度随时间延长逐渐下降,趋于正视状态;术后各时间点术眼等效球镜度低于术前,术后1、3、6和12个月术眼等效球镜度低于术后1周,术后12个月低于术后3和6个月,差异均有统计学意义(均P<0.001)。术后3、6及12个月术眼角膜K1值、K2值均明显低于术前,差异均有统计学意义(均P<0.001),术后3个月角膜K1值、K2值趋于稳定。术后3、6、12个月术眼眼压均显著低于术前,术后6和12个月术眼眼压低于术后1和3个月,差异均有统计学意义(均P<0.001)。术后1周1眼出现0.5级角膜上皮下雾状混浊,于术后1个月角膜自行恢复透明。结论Trans-PRK联合预防性快速CXL手术矫治合并薄角膜或角膜形态欠规则的(除外圆锥角膜)屈光不正眼具有良好的有效性、稳定性及安全性。

经上皮准分子激光屈光性角膜切削术(TPRK)及飞秒激光辅助的准分子激光原位角膜磨镶术(FS-LASIK)后眼轴长度及角膜光密度的变化

目的观察经上皮准分子激光屈光性角膜切削术(transepithelial photorefractive keratectomy,TPRK)及飞秒激光辅助的准分子激光原位角膜磨镶术(femtosecond laser-assisted in situ keratomileusis,FS-LASIK)手术前后眼轴长度及角膜光密度(corneal density,CD)的变化,并探讨二者间相关性。方法回顾性分析。使用IOL Master 500测量TPRK组(72眼)和FS-LASIK组(42眼)患者术前及术后3个月的眼轴长度,同时使用Pentacam进行角膜厚度测量及CD分析。对手术前后眼轴差与角膜消融厚度之间的差异性、相关性及一致性进行分析,同时分析IOL Master眼轴测量偏差(眼轴差与角膜消融厚度间差值)与CD变化的相关性。结果TPRK组及FS-LASIK组手术前后眼轴差分别为(0.09±0.04)mm、(0.11±0.05)mm,角膜消融厚度分别为(0.09±0.02)mm、(0.09±0.03)mm,二者之间显著正相关(r=0.486、0.494,均为P<0.01),差异均无统计学意义(t=1.534、1.995,均为P>0.05),Bland-Altman分析显示二者一致性好。TPRK组角膜前层(120μm)及全层的CD术后低于术前,中间层及后层(60μm)的CD术后高于术前。FS-LASIK组眼轴测量偏差仅与0~2 mm前层的CD中等相关(r=0.356,P<0.05)。结论TPRK及FS-LASIK术后患者眼轴长度均较术前短,二者差值与角膜消融厚度相符。TPRK及FS-LASIK术后3个月CD略有降低,但IOL Master眼轴测量偏差与CD的变化基本不相关。

智能脉冲技术辅助TPRK术的临床疗效

目的:观察智能脉冲技术(SPT)辅助的经上皮准分子激光角膜切削术(TPRK)的临床效果。方法:回顾性非随机性研究。选取2017-08/2018-05在我院接受SPT辅助的TPRK手术的近视患者260例508眼,术后随访3mo,检测患者的裸眼视力(UCVA)和等效球镜度,观察角膜上皮愈合情况,评估患者的疼痛度及满意度情况。结果:本组患者术后5d内在配戴角膜绷带镜的状态下可以进行日常生活及一般工作,术后1、3moUCVA(-0.080±0.0798、-0.108±0.089)均达到甚至优于术前BCVA(-0.050±0.0561)。术后5d,所有患者的角膜上皮均完全修复,术后1、3mo随访,仅3例4眼患者在裂隙灯显微镜下观察到不影响视力的haze(0~1级)。本组患者208例术后当天感觉疼痛,均于1d后缓解,3d后完全消失。术后3mo进行满意度调查显示93.0%患者非常满意。结论:SPT辅助的TPRK术治疗近视临床效果较好,术后视力恢复快,角膜上皮重塑时间短,能很好地缓解表层手术后疼痛,患者满意度较高。

角膜波前像差引导TPRK矫正中高度近视的应用研究

目的比较角膜波前像差引导的经上皮准分子激光角膜切削术(CW-TPRK)和准分子激光上皮下角膜磨镶术(LASEK)矫正中高度近视的临床效果。方法采用回顾性非随机对照研究,选择行角膜波前像差引导的TPRK(CW-TPRK组)患者109例(215眼)和准分子激光上皮下角膜磨镶术患者(LASEK组)112例(220眼),对比术后上皮愈合时间和术后1周、1个月、2个月、3个月的裸眼视力及角膜上皮下雾状混浊(Haze)的发生率。结果 CW-TPRK组术后上皮愈合时间为(2.9±0.3) d,LASEK组术后上皮愈合时间为(5.9±1.1) d,两组差异有统计学意义(P<0.01)。术后1周,CW-TPRK组的裸眼视力为5.10±0.60,LASEK组的裸眼视力为4.99±0.40,两组差异有统计学意义(P<0.05)。术后1个月、2个月、3个月的裸眼视力,两组差异无统计学意义(P>0.05)。随访3个月,CW-TPRK组3眼发生0.5级Haze(发生率1.40%),LASEK组3眼发生0.5级Haze、2眼发生1级Haze(发生率2.27%),两组差异有统计学意义(P<0.05)。结论角膜波前像差引导的TPRK和准分子激光上皮下角膜磨镶术均能安全地完成治疗,获得满意的术后视力,但CWTPRK术后上皮愈合时间更短,视力恢复更快,Haze发生率更低。

TransPRK与SMILE术后早期角膜生物力学对比研究

目的探讨经上皮准分子激光角膜切削术(TransPRK)与飞秒激光小切口角膜基质透镜取出术(SMILE)对术后早期角膜生物力学的影响。方法采用队列研究,连续纳入2020年11月至2021年6月于大连医科大学附属大连市第三人民医院自愿行TransPRK的患者56例56眼和SMILE患者52例52眼,均纳入右眼数据进行分析。术后随访3个月,收集术眼术后1个月、术后3个月中央角膜厚度(CCT)和角膜曲率(Km),收集术前、术后1个月、术后3个月眼反应分析仪测量的角膜补偿眼压值(IOPcc)、角膜阻力系数(CRF)、角膜滞后量(CH)及19个重复性较好的力学红外信号波形参数。比较各组不同时间点各测量指标的差异。结果2个组术后1个月、3个月术眼CCT、Km及IOPcc比较,差异均无统计学意义(均P>0.05)。2个组术后1个月CRF、CH、p1area、p2area、p1area1、p2area1、w1、w2、w11、w21、h1、h2、h11、h21、dive1、dive2、mslew1较术前下降,path1、path2、path11、aplhf较术前升高,差异均有统计学意义(均P<0.05)。2个组术后3个月CRF、CH、p1area、p2area、p1area1、p2area1、w1、w2、w11、w21、h1、h2、h11、h21、dive1较术前下降,path1、path2、path11、aplhf较术前升高,差异均有统计学意义(均P<0.05);SMILE组术后3个月dive2较术前下降,差异有统计学意义(P<0.01)。术后1个月,TransPRK组p1area、p2area、p1area1、p2area1、w1、w2、w11、w21、dive1、dive2大于SMILE组,CH、path1、path2、path11小于SMILE组,差异均有统计学意义(均P<0.05)。术后3个月,TransPRK组p1area、p2area、p1area1、p2area1、w1、w2、w11、w21、h2、h21、dive1、dive2大于SMILE组,path1、path2、path11小于SMILE组,差异均有统计学意义(均P<0.05)。结论TransPRK和SMILE术后角膜生物力学均减弱,术后早期TransPRK眼反应分析仪红外波形力学参数优于SMILE。

SPT辅助的1050Hz切削频率TransPRK与SMILE术后视觉质量的比较

目的:比较智能脉冲技术(SPT)辅助的1 050Hz切削频率经上皮准分子激光角膜切削术(TransPRK)与飞秒激光小切口角膜基质透镜取出术(SMILE)矫正近视和散光的视觉质量。方法:纳入2020-07/2021-01在成都中医药大学附属眼科医院接受角膜屈光手术的138例248眼患者,按术式分为TransPRK组(64例123眼)和SMILE组(74例125眼)。术后随访6mo,记录LogMAR视力,使用Sirius眼前节综合分析仪测量术前和术后不同时间点6mm瞳孔直径下斯特列尔比值(SR)和高阶像差。结果:与SMILE组相比,术后1wk,1mo,TransPRK组UCVA更差(均P<0.05);术后6mo,TransPRK组UCVA更优(P<0.05)。术后1wk,1mo,TransPRK组SR值比SMILE组低(均P<0.05);术后3、6mo,两组间SR值无显著差异(P=0.968、0.433)。术后1wk,两组间彗差无显著差异(P=0.554);术后1、3、6mo,TransPRK组彗差比SMILE组更低(均P<0.05)。术后1wk,1、3mo,TransPRK组三叶草像差比SMILE组更高(均P<0.05);术后6mo,两组间三叶草像差无显著差异(P=0.167)。术后6mo,TransPRK组和SMILE组UCVA分别为-0.13±0.05、-0.11±0.08,均优于各组术前的BCVA(-0.07±0.05、-0.07±0.05)(均P<0.05);且各组SR值较术前更高(均P<0.05)。结论:SPT辅助的1 050Hz切削频率TransPRK与SMILE矫正近视和散光术后均可获得较好的视力,SMILE术后1wk,1mo的视觉质量更好,但SPT辅助的1 050Hz切削频率TransPRK术后6mo的视力优于SMILE,且角膜彗差更小。

T-PRK与SMILE矫正低度近视的视觉质量观察

目的:观察经上皮准分子激光角膜切削术(T-PRK)与飞秒激光小切口角膜基质透镜取出术(SMILE)矫正低度近视的角膜像差变化及视觉质量特点。方法:前瞻性队列研究。选取2021-04/2022-04于潍坊眼科医院行T-PRK手术32例32眼及SMILE手术45例45眼的低度近视患者,比较两组术后裸眼视力(UCVA)、最佳矫正视力(BCVA)、等效球镜(SE)、角膜高阶像差(HOAs)及客观视觉质量。结果:所有患者均顺利完成手术,未见感染等并发症。术后3mo,T-PRK组与SMILE组的安全指数分别为1.13±0.16和1.16±0.17(P=0.48),有效指数分别为1.10±0.20和1.15±0.18(P=0.27)。T-PRK组和SMILE组UCVA(LogMAR)≤0的占比分别为94%和98%。两组残余SE在±0.50D内的占比分别为88%和87%。两组患者HOAs和球差均显著升高(P≤0.01),且两组间增加量无差异(P=0.31、0.89)。两组患者水平彗差、水平三叶草、垂直三叶草均无显著性变化(P>0.05)。SMILE组垂直彗差显著升高(P<0.001),而T-PRK组无显著性变化(P>0.05),且SMILE组的增加量明显大于T-PRK组(P<0.001)。两组间OSI、MTF_(cut off)、SR、VA100%、VA20%、VA9%比较均未见差异(P>0.05)。结论:T-PRK与SMILE矫正低度近视均有良好的安全性、有效性和视觉质量,SMILE手术与T-PRK手术相比诱导更多的垂直彗差。

不同程度近视散光患者TransPRK术后功能性光学区的临床分析

目的:评估术前近视散光大小及角膜前表面曲率对经上皮准分子激光角膜表面切削术(TransPRK)后功能性光学区(FOZ)的影响。方法:采用回顾性分析,选择近视及近视散光患者78例130眼应用TransPRK治疗,根据柱镜度不同分为:对照组,柱镜度0D;中度散光组,柱镜度-0.50~-2.00D;高度散光组,柱镜度>-2.00~<-6.00D。测量并比较术后6mo三组FOZ大小,分析拟矫屈光度、角膜前表面曲率变化、角膜像差变化、Q值变化与FOZ的相关性。结果:术后6mo,对照组平均FOZ为5.16±0.12mm,中度散光组为5.29±0.23mm,高度散光组为5.49±0.23mm(P<0.001)。高度散光组FOZ明显大于中度散光组和对照组(P<0.05,<0.001);Pearson相关分析表明,等效球镜度变化量、角膜总高阶像差(HOAs)变化量、彗差变化量、球差变化量与FOZ均呈负相关(均P<0.05);陡峭曲率(K2)、平均曲率(Km)、角膜散光变化量、Q值变化量与FOZ均呈正相关(均P<0.01)。多元线性回归分析表明,在去除其他危险因素后,术前K2仍与FOZ呈正相关(P<0.001)。结论:高度散光患者在TransPRK后获得较大FOZ和引入较少彗差。术前陡峭曲率高近视散光眼将取得较大FOZ。

近视眼SMILE与SPT-TransPRK术后早期视觉质量比较

目的探讨飞秒激光小切口角膜基质透镜取出术(SMILE)与智能脉冲技术辅助经上皮准分子激光角膜切削术(SPT-TransPRK)术后早期视觉质量的差异和变化情况。方法采用队列研究方法,选取2021年2—5月于大连医科大学附属大连市第三人民医院行角膜屈光手术者92例92眼,均为右眼入组,其中SMILE组40例40眼,SPT-TransPRK组52例52眼。分别于术前及术后1个月、3个月检查受检者视力,计算有效性,有效性=术后裸眼视力(UCVA)/术前最佳矫正视力;采用AR-1自动电脑验光仪测量屈光度;采用Sirius角膜地形图测量角膜高阶像差(HOA),包括总HOA、球差和彗差;采用OQASⅡ视觉质量分析系统测量客观散射指数(OSI),调制传递函数截止频率(MTF cut-off),斯特列尔比(SR),模拟对比度视力VA100、VA20和VA9(白天、黄昏、夜晚)。结果术后3个月,SMILE组与SPT-TransPRK组UCVA、有效性比较差异均无统计学意义(Z=0.880,P=0.380;t=0.920,P=0.058),SPT-TransPRK组术后表现为低度远视。术前、术后1个月和术后3个月SMILE组总HOA分别为(0.47±0.18)、(0.70±0.22)和(0.74±0.19)μm,SPT-TransPRK组分别为(0.40±0.14)、(0.98±0.35)和(0.94±0.22)μm;术前、术后1个月和术后3个月SMILE组球差分别为(-0.20±0.09)、(-0.44±0.14)和(-0.44±0.15)μm,SPT-TransPRK组分别为(-0.20±0.10)、(-0.71±0.23)和(-0.75±0.20)μm。2个组术眼手术前后不同时间点总HOA和球差比较,差异均有统计学意义(总HOA:F_(分组)=13.851,P=0.001;F_(时间)=29.960,P<0.001.球差:F_(分组)=31.037,P<0.001;F_(时间)=48.005,P<0.001),其中2个组术后角膜总HOA、球差均较术前增加,差异均有统计学意义(均P<0.05);术后1个月和3个月,SMILE组术眼总HOA和球差均小于SPT-TransPRK组,差异均有统计学意义(均P<0.05)。2个组术后1个月、3个月角膜彗差较术前增加,差异均有统计学意义(均P<0.05)。SMILE组术后1个月OSI高于术前,MTF cut-off、SR和VA9低于术前,差异均有统计学意义(均P<0.05);术后3个月OSI高于术前,SR和VA9低于术前,差异均有统计学意义(均P<0.05)。SPT-TransPRK组术后1个月OSI高于术前,MTF cut-off、SR、VA100、VA20和VA9低于术前,差异均有统计学意义(均P<0.05),术后3个月OSI、MTF cut-off、SR、VA100、VA20和VA9与术前比较差异均无统计学意义(均P>0.05)。2个组间术眼彗差、OSI、MTF cut-off、SR、VA100、VA20和VA9总体比较差异均无统计学意义(均P>0.05)。结论SMILE和SPT-TransPRK均是矫正近视的有效方法,术后早期视觉质量相似,但相较SPT-TransPRK,SMILE引起更小的角膜总HOA与球差改变。