高度近视LASIK治疗中角膜瓣厚度的临床分析

目的分析高度近视LASIK治疗中,影响角膜瓣厚度的因素。方法40例(80只眼)屈光度为-7.00D~-9.00D的高度近视患者,运用MoriaM2板层刀制作角膜瓣,对角膜曲率不同、板层刀负压吸引力不同、M2刀片新旧不同进行分组,对术前、术后屈光度、视力及剩余角膜基质床厚度进行分析比较。结果Ⅰ组板层刀负压吸引力相同时角膜曲率不同,制作出的角膜厚度不同,两者有明显差异(P<0.05);Ⅱ组角膜曲率相同,板层刀负压吸引力不同,制作出的角膜瓣厚度不同,两者有明显差异(P<0.05);Ⅲ组板层刀片新旧不同,制作出角膜瓣的厚度不同,两者有明显差异(P<0.05);结论LASIK治疗高度近视时,对一个有经验的手术医生制作一个80~110μm的薄角膜瓣是合理的,能有效防止术后屈光回退和医源性圆锥角膜的发生。     

LASIK术中110μM角膜瓣的临床应用观察

目的探讨LASIK术中运用90μ厚刀头制作110μm角膜瓣的技巧和效果。方法采用Moria M2双马达自动旋转式显微角膜刀为937例(1834只眼)行准分子激光原位角膜磨镶术(LASIK)的患者制作角膜瓣。刀头选择90μ厚,终止环设定在7.5位置,吸力环根据角膜曲率表选择。结果所有患眼角膜瓣制作均顺利,除2例纽孔样角膜瓣外,无不良瓣,蒂大小适中,瓣翻转自如,复位容易。无卡刀及中途停顿现象,术后除2例角膜瓣皱褶需重新复位外其余对合复位良好。结论Moria M2 90μ厚显微角膜刀所制作薄角膜瓣在厚度上有良好可预测性,尽可能保留更多厚度基质床,明显提高了手术的安全性。     

两种微型角膜板层刀在准分子激光原位角膜磨镶术的效果比较

目的对MoriaM2130型(以下简称M2)一次性微型角膜刀头(自带刀片)与微型角膜刀片的角膜瓣制作效果进行比较。方法59例准分子激光原位角膜磨镶术(laser in situ keratomileusis,LASIK)手术患者(113眼),随机使用两种刀来制作角膜瓣,记录角膜瓣直径、蒂长,术后应用共焦显微镜测量瓣厚,记录术中和术后的并发症,对结果作统计分析比较。结果使用M2一次性刀头与M2刀片时,制作的角膜瓣平均厚度分别为(139.35±19.07)μm、(126.92±11.50)μm(t=4.096,P<0.01)。同一患者双眼使用同一把刀,两眼角膜瓣厚度无明显差异。术中角膜瓣的制作均一次成功,无严重并发症。结论M2型一次性刀头与刀片均具有安全性和稳定性。一次性刀头使用更方便,角膜瓣下干净,但角膜瓣厚度的平均值较高,标准误差较大。M2型刀片的角膜瓣制作效果相对稳定,但角膜瓣下残留相对多的金属颗粒。     

准分子激光原位角膜磨镶术二次使用角膜刀制作角膜瓣厚度分析

目的 分析准分子激光原位角膜磨镶术(laser in situ keratomileusis,LASIK)中二次使用角膜刀制作角膜瓣的厚度.方法 应用MoriaM2显微角膜刀制作角膜瓣,每位患者用同一角膜刀制作双眼角膜瓣,手术顺序为先右眼后左眼,角膜瓣厚度为手术前角膜厚度减去角膜瓣下激光切削前角膜基质厚度.按手术顺序分为首次刀片使用组(右眼组)和二次刀片使用组(左眼组),对角膜瓣厚度进行统计学分析.结果 首次刀片使用组角膜瓣厚度平均(144.46±20.25)μm,二次刀片使用组角膜瓣厚度平均(131.64 ±20.46)μm,差异有统计学意义(P<0.01).两组角膜瓣厚度均比角膜瓣厚度标识值(160 μm)薄,差异有统计学意义(P<0.01).结论 首次使用角膜刀组(右眼组)角膜瓣厚度比二次使用角膜刀组(左眼组)厚.MoriaM2显微角膜刀所做角膜瓣比预测值薄,角膜瓣厚度在一定范围内变化.     

两种微角膜刀所制角膜瓣对LASIK术后角膜循规性散光的影响

目的　探讨两种微角膜刀所制角膜瓣对LASIK术后角膜循规性散光的影响。方法　循规性近视散光患者 96人 ( 180眼 )随机分为Ⅰ、Ⅱ两组 ,分别采用MoriaLSK -One平推式气动微角膜刀和MoriaM 2旋转式微角膜刀制做角膜瓣 ,然后进行激光手术。术后 6个月观察患者的角膜散光及角膜散光轴的变化。结果　术后 6个月 ,Ⅰ组、Ⅱ组角膜散光值分别为 0 3 6± 0 13D和 0 5 2±0 0 9D ,与术前相比 ,分别下降 1 3 5± 0 11D ,1 0 8± 0 10D ,差异显著 (P <0 0 1)。而散光轴无明显改变。结论　与MoriaLSK -One平推式气动微角膜刀相比 ,MoriaM 2旋转式微角膜刀所制角膜瓣有产生循规性角膜散光的趋势     

自动角膜板层刀制作的角膜瓣与中央角膜曲率的关系

目的 :探讨平均中央角膜曲率与制作的角膜瓣平均直径、角膜瓣蒂长度的关系。方法 :对 30 0例 6 0 0只眼近视患者术前用角膜地形图测量平均中央角膜曲率 ,其中平坦角膜组、中等角膜曲率组和陡峭角膜组各 2 0 0只眼。采用NidekMK 2 0 0 0型自动角膜板层刀 ,负压环选择 8.5mm角膜瓣直径 ,制作角膜瓣后测量角膜瓣平均直径和蒂长度。结果 :平坦角膜组、中等角膜曲率组和陡峭角膜组的角膜瓣平均直径分别为 (8.35± 0 .34)mm、(8.6 6± 0 .30 )mm和 (8.93±0 .33)mm ;蒂长度分别为 (4.76± 0 .5 0 )mm、(5 .4 1± 0 .5 4 )mm和 (5 .81± 0 .4 3)mm ,差异均有非常显著性 (P <0 .0 1)。结论 :平均中央角膜曲率越高 ,角膜瓣平均直径越大 ,角膜瓣蒂越长。角膜瓣直径小 ,提供的切削区小 ;角膜瓣蒂短 ,易发生游离角膜瓣。手术医生术前应注意中央角膜曲率与角膜瓣的关系 ,预防术中角膜瓣并发症的发生。自动角膜刀具有操作简单、方便、安全性高的优点。     

M2显微角膜刀同一刀片一次和二次切削对制作角膜瓣厚度的影响

目的测定角膜瓣厚度,分析比较两次切削对制作角膜瓣厚度的影响。方法双眼同时行近视准分子激光原位角膜磨镶术(LASIK)的患者50例,男性27例(54只眼),女性23例(46只眼)。使用M2自动旋转式130金属刀头显微角膜刀制作角膜瓣,术前、术中用A超角膜测厚仪进行角膜厚度测量并记录推算角膜瓣厚度,将所得数据分为第一次切削眼组和第二次切削眼组并进行统计学分析。结果两组角膜厚度无显著性差异(P＞0.05);刀片两次切削所制作的角膜瓣厚度有显著性差异(P＜0.05)。结论刀片的第二次切削所制作的角膜瓣厚度与第一次切削相比较,所制作的角膜瓣变薄。     

LASIK角膜瓣厚度与中央角膜曲率的关系

目的探讨平均角膜中央曲率与所制角膜瓣厚度之间的关系。方法对19例(38只眼)近视患者术前行眼前节分析仪及A超仪检查测得中央角膜曲率及中央角膜厚度,采用HANSTOME 160μm微型角膜板层刀、直径8.5cm吸附环,制作角膜瓣后,掀开角膜瓣,测量基质床中央角膜厚度,即得到所制角膜瓣厚度,所有患者手术先做右眼后做左眼。结果中央区最大角膜曲率(K_1)均值为44.3875D,中央区最小角膜曲率(K_2)为43.225D,角膜中央厚度为(529±16.1)μm,角膜瓣厚度为：右眼(112.33±8.2)μm,左眼(100.889±3.1)μm,平均角膜基质床厚度：右眼(402.5±12.1)μm,左眼(415.22±14.7)μm。平均中央角膜曲率、角膜中央厚度分别与角膜瓣厚度值经统计学处理,均P＞0.05,而右眼与左眼角膜瓣厚度差,P＜0.05,右眼角膜瓣厚度大于左眼。结论平均中央角膜曲率与角膜瓣厚度之间无相关。右眼与左眼的角膜瓣厚度之间均有差异性,提示中央角膜曲率不是影响角膜瓣厚度的因素;左眼中央角膜厚度比右眼厚时可考虑先行左眼角膜瓣的制作,以尽可能保留更多的角膜基质床。     

两种微型角膜刀在LASIK手术中的应用

目的　比较气动往复式和电动旋转式微型角膜刀在 L ASIK手术中的应用效果。观察两种角膜刀的应用特点 ,对术后视力、屈光度、角膜地形图的影响。方法　使用气动往复式和电动旋转式微型角膜刀行 L ASIK手术共 330例 (6 34只眼 ) ,其中往复刀切削组 93例 (184只眼 ) ,旋转切削组 2 37例 (4 5 0只眼 )。根据屈光度将两组患者分为 (- 6 .0 0 D以下 )和 组 (- 6 .0 0 D～ - 10 .0 0 D)。对术后 1天、10天、1月、3月复诊的裂隙灯、验光、角膜地形图记录资料作回顾性分析。结果　旋转微型角膜刀自动化程度高 ,性能稳定 ,做出的角膜瓣质量高。 SCMD微型角膜刀控制因素较多 ,熟练操作和经验积累过程较长 ,但调节灵活 ,适应于不同情况的患者。两组患者在术前屈光度、矫正视力上无明显差别 (P >0 .0 5 )。 Hansatom e组比 SCMD组在术后 1天、10天、1月、3月患者的视力、矫正视力、残存球镜、散光、角膜地形图散光上更为满意 ,统计结果显示明显的差异性。结论　两种微型角膜刀均可制作良好的角膜瓣。旋切刀可以提供术后更好的视力和平滑的角膜瓣 ,往复刀出现术后角膜散光和角膜瓣的微纹 ,术后3月两种术式患者屈光状态基本保持一致     

Moria M2微型角膜刀用常规刀片及Med—Logics 0号刀片制作LASIK角膜瓣的评估

背景角膜瓣的制作是准分子激光角膜原位磨镶术（LASIK）成功的关键步骤之一,随着微型角膜刀刀片技术的不断发展,其制作角膜瓣的精确性、均一性以及重现性已引起临床医师的广泛关注。目的比较MoriaM2微型角膜刀110刀头应用Med—Logics 0号刀片（110—0）及常规刀片（110）制作LASIK角膜瓣的特点。方法前瞻性研究。对近视患者102例204眼行LASIK,其中MoriaM2微型角膜刀110刀头应用Med—Logics0号刀片组（110—0组）及常规刀片组（110组）制作角膜瓣的患者各51例102眼。术后1周,应用RTVue傅里叶光学相干断层扫描（OCT）分别测量2组患者每个角膜上0°、45°、90°和135° 4条子午线所在截面上特定7个点的角膜瓣厚度,并对每个角膜瓣上28个测量点的角膜瓣厚度值进行对比分析。结果术后1周,110—0组和110组间裸眼视力和残余等效球镜度的差异均无统计学意义（视力：Z=-0．375,P=0．708;球镜度：u=0．056,P=0．956）。110—0组全角膜厚度为（133．28±15．41）μm,明显低于110组的（142．81±10．07）μm,差异有统计学意义（u=-5．227,P〈0．01）,并且110—0组与Moria公司提供的角膜瓣预期厚度值130μm更接近。2组制作的角膜瓣均为中间薄、周边厚,形状近似一凹透镜,并且2组右眼鼻侧和颞侧角膜瓣厚度比较差异均无统计学意义（P〉0．05）;左眼鼻侧均明显厚于颞侧,差异均有统计学意义（P〈0．05）。110—0组与110组角膜瓣厚度值与预计厚度130μm的差值分别为（17．46±2．28）μm和（16．82±6．12）μm,差异无统计学意义（u=0．517,P=0．608）。结论与110组比较,110—0组角膜瓣的厚度更薄,全角膜瓣厚度平均值与Moria公司提供的角膜瓣预期厚度值130μm更接近,其角膜瓣的均一性和预测性相对更好一些。     

Corneal flap thickness in laser in situ keratomileusis using the Moria M2 microkeratome

PURPOSE: To determine the predictability of flap thickness in laser in situ keratomileusis (LASIK) using the Moria M2 microkeratome and identify factors that may be related to variations in flap thickness. SETTING: Laser Vision Correction Center, Bascom Palmer Eye Institute, University of Miami School of Medicine, Miami, Florida, USA. METHODS: Charts of 208 patients having same-day bilateral LASIK using the Moria M2 microkeratome were reviewed. Intraoperative pachymetry was performed routinely. The right eye was always treated first. The same suction ring, stop, microkeratome head (110 microm or 130 microm), and blade were used in fellow eyes. Subtraction pachymetry was used to calculate flap thickness. Other collected data included age, keratometry, corneal diameter, and preoperative spherical equivalent (SE). RESULTS: With the 110 microm head and slow translation velocity in both eyes, the mean flap thickness was 151.6 microm +/- 24.0 (SD) and 148.5 +/- 24.3 microm in the right and left eyes, respectively. With the 110 microm head and fast translation velocity in both eyes, the mean thickness was 136.2 +/- 25.5 microm and 132.8 +/- 23.5 microm, respectively. With the 130 microm head and fast translation velocity, the mean flap thickness was 145.8 +/- 25.4 microm and 139.9 +/- 25.5 microm, respectively. Flaps were thinner with fast translation velocity, the 110 microm head, and presumably duller blades used in the left eyes. There was a weak but statistically significant inverse correlation between flap thickness and age and between flap thickness and SE. A stronger correlation was found in flap thickness between right and left eyes. CONCLUSIONS: Flap thickness with the Moria M2 microkeratome was variable. Fast translation velocity, a used (presumably duller) blade, and the 110 microm head produced thinner flaps. Given the potential variation in flap thickness (SD 23.5 to 25.5 microm), intraoperative pachymetry might be an adjunctive measure to prevent residual stromal beds that are thinner than planned, especially in patients with high myopia and/or thin corneas.     

Reproducibility of flap thickness with IntraLase FS and Moria LSK-1 and M2 microkeratomes

PURPOSE: To compare flap thickness reproducibility of the femtosecond laser and two mechanical microkeratomes. METHODS: Flap thickness for all eyes was measured as the difference between the preoperative (day of surgery) full corneal thickness and post-flap creation central stromal bed thickness using ultrasonic pachymetry. Flap thickness values produced by three different microkeratome systems were compared for accuracy and reproducibility. RESULTS: For 99 flaps created using the IntraLase FS laser with an intended thickness of 110 microm, the mean achieved thickness was 119 +/- 12 microm (range: 82 to 149 microm). In 100 eyes treated with the Moria LSK-1 microkeratome with an intended flap thickness of 160 microm, the mean achieved thickness was 130 +/- 19 microm (range: 71 to 186 microm). In 135 eyes treated with the Moria M2 microkeratome with an intended flap thickness of 130 microm, mean thickness was 142 +/- 24 microm (range: 84 to 203 microm). The standard deviation and range of corneal flap thickness created with the IntraLase FS laser was significantly smaller than either mechanical microkeratome (P < .0001). CONCLUSIONS: When compared to two commonly used mechanical microkeratomes, mean achieved flap thickness was more reproducible with the IntraLase FS laser, reducing the comparative risk of overly thick flaps.     

Corneal flap thickness with the Moria M2 single-use head 90 microkeratome

PURPOSE: To analyse the accuracy of corneal flap thickness created in laser-assisted in situ keratomileusis (LASIK) using the Moria Model 2 (M2) single-use head 90 microkeratome. METHODS: The corneal thickness of 300 (266 myopic and 34 hyperopic) eyes of 150 patients was measured by ultrasonic pachymetry preoperationally and intraoperationally after flap cut. The Moria M2 single-use head 90, intended to create a flap with a thickness of 120 microm, was used in all eyes. The right eye was always operated first and the left eye second, using the same blade. RESULTS: Mean corneal flap thickness was 115.4 microm (standard deviation [SD] 12.5) in the two eyes, 115.7 microm (SD 12.4, range 73-147 microm) in right eyes and 115.1 microm (SD 12.6, range 74-144 microm) in left eyes. Mean horizontal flap diameter was 9.1 mm (SD 0.2) and mean hinge length 4.1 mm (SD 0.1). There were no free flaps, incomplete flaps or flaps with buttonholes in the study. Occasional iron particles were observed in three (1.0%) eyes. CONCLUSIONS: As with most microkeratomes, the single-use head 90 microkeratome cut thinner flaps than were intended. The range of the cuts was relatively wide. However, thin flaps did not increase the rate of flap-related complications. The difference between the first and second eyes was not significant.     

两种不同制瓣方式对LASIK术角膜瓣厚度的影响

目的:比较Ziemer LDV飞秒激光与Moria M2机械板层刀不同制瓣方式对LASIK术角膜瓣厚度的影响。 方法：选取近视患者100例200眼（近视度数-2.00~-12.00D,散光度数0.00 ~ -3.50D）,分别应用Ziemer LDV飞秒激光（设定角膜瓣切削厚度110μm）与Moria M2 （110刀头）微型角膜刀制作角膜瓣,各50例 100眼。术后1wk,应用眼前节RTVue FD-OCT 测量,每个角膜上 0°,45°,90°,135°四条子午线所在截面上中心点、距离中心1,2,3mm特定7个点（共计28个点）的角膜瓣厚度测量,并作分析比较。 结果:角膜瓣中央点厚度:Ziemer LDV飞秒激光组108.69±11.75μm,Moria M2 微型角膜刀组130.75±13.36μm,所有观测点（共28点）两组间有明显统计学差异（P<0.01）。角膜中心点厚度与预计值差值比较:Ziemer LDV飞秒激光组 9.70±6.84μm,Moria M2 微型角膜刀组 21.63±11.79μm。Ziemer LDV飞秒激光组预计值差值明显低于Moria M2 微型角膜刀组（t=17.493,P＜0.01）。Ziemer LDV飞秒激光组与Moria M2微型角膜刀组同一截面中各点角膜瓣厚度值差异有统计学差异（P<0.01）。 结论:角膜瓣制作方式相比,在角膜瓣的精确性、可预测性等方面 Ziemer LDV飞秒激光优于Moria M2 微型角膜刀。Ziemer LDV组与Moria M2 机械板层刀组都未表现角膜瓣厚度的均匀性。     

Very high-frequency digital ultrasound measurement of the LASIK flap thickness profile using the IntraLase femtosecond laser and M2 and Carriazo-Pendular microkeratomes

PURPOSE: To evaluate the corneal aberrometric outcomes and corneal flap thickness profile after LASIK using three different devices for lamellar keratotomy: Moria M2 microkeratome, SCHWIND Carriazo-Pendular microkeratome, and IntraLase femtosecond laser. METHODS: Sixty-six myopic eyes of 33 patients who underwent LASIK with the SCHWIND ESIRIS excimer laser were enrolled in this study. Lamellar keratotomy was performed using three different devices that were assigned randomly to each patient: the Moria M2 microkeratome, SCHWIND Carriazo-Pendular microkeratome, and IntraLase femtosecond laser. The intended flap depth was 110 microm in all cases. Flap thickness profile, corneal aberrations, contrast sensitivity, and refractive outcomes were evaluated. RESULTS: Mean central flap thickness was 117.50 +/- 7.80, 118.08 +/- 8.34, and 115.95 +/- 6.22 microm for the M2, Carriazo-Pendular, and IntraLase systems, respectively. No significant differences were found among the groups. Nasal thicknesses were significantly larger for the M2 flaps compared to IntraLase (P < .05) and Carriazo-Pendular flaps (P = .046 only at 3-mm position). Temporal thicknesses were larger for the M2 flaps, although only differences between M2 and Carriazo-Pendular flaps reached statistical significance. Larger superior and inferior thicknesses were also observed for M2 flaps, although no statistically significant differences were found. Regarding corneal aberrometry, no statistically significant differences were observed in coma-like (P = .138) and spherical-like root-mean-square (P = .300). CONCLUSIONS: The M2, Carriazo-Pendular, and IntraLase systems create flaps of predictable thickness during lamellar keratotomy in LASIK. Additionally, the Carriazo-Pendular and IntraLase devices create flaps with a planar profile.     

Moria M2 single use microkeratome head in 100 consecutive LASIK procedures

PURPOSE: To evaluate the safety and efficacy of the Moria M2 single use 130 microkeratome head in consecutive LASIK procedures for correction of myopia and myopic astigmatism. METHODS: One hundred eyes of 55 patients underwent LASIK in which the flaps were created with the Moria M2 microkeratome using the single use 130 head and excimer laser ablation was done with the Allegretto Wave-light laser. Flap parameters measured were: thickness, diameter, hinge length, and overall quality. Preoperative uncorrected visual acuity (UCVA), best spectacle-corrected visual acuity (BSCVA), refraction, wavefront aberrations, and low contrast sensitivity were compared to postoperative values at 6-month follow-up. RESULTS: Mean flap thickness was 145 +/- 17.5 microm, mean flap diameter was 8.5 +/- 0.40 mm, and mean hinge cord length was 4.05 +/- 0.35 mm. At 6-month follow-up, UCVA improved from 20/200 (+/-0.24) to 20/18.5 (+/-0.12) and BSCVA improved from 20/20.5 (+/-0.18) to 20/17.5 (+/-0.11). CONCLUSIONS: The Moria M2 single use 130 microkeratome head appears to be safe and effective in performing LASIK procedures.     

LASIK flap characteristics using the Moria M2 microkeratome with the 90-microm single use head

PURPOSE: To evaluate the accuracy and consistency of corneal flap thickness, horizontal diameter, and hinge size with the Moria M2 90-microm single use head. METHODS: Fifty-two myopic patients (104 eyes), mean age 32.6 years, underwent bilateral LASIK with a superior hinged flap using the Moria M2 microkeratome (90-microm single use head). Prospective evaluation included flap thickness (subtraction method), diameter, hinge size, interface particles, intraoperative complications, and visual recovery. RESULTS: The mean preoperative spherical equivalent refraction was -5.72 +/- 2.59 diopters (D) (range: -2.88 to -10.75 D) and -5.84 +/- 2.73 D (range: -3.13 to -9.38 D) for right and left eyes, respectively. The mean preoperative central corneal thickness was 548 +/- 24 microm and 547 +/- 25 microm for right and left eyes, respectively. The mean preoperative steepest K was 44.12 +/- 1.28 D and 44.41 +/- 1.27 D for right and left eyes, respectively. Corneal diameter (white-to-white) was 12 +/- 0.4 mm and 11.9 +/- 0.4 mm for right and left eyes, respectively. The mean postoperative flap thickness was 109 +/- 18 microm (range: 67 to 152 microm) and 103 +/- 15 microm (range: 65 to 151 microm) for right and left eyes, respectively. The mean postoperative flap diameter was 9.4 +/- 0.3 mm (expected mean according to the nomogram given by the company was 9.5 mm). The mean postoperative hinge chord was 4.4 +/- 0.4 mm (expected mean 4.2 mm). No interface particles were detected on slit-lamp examination. CONCLUSIONS: The Moria M2 90-microm single use head is safe with reasonable predictability for LASIK flap creation.     

Thin flap laser in situ keratomileusis: flap dimensions with the Moria LSK-One manual microkeratome using the 100-microm head

PURPOSE: To determine the predictability and consistency of corneal flap thickness, flap diameter, and hinge length with the modern 100 microm head of the Moria LSK-One manual microkeratome. SETTING: Private clinic, office-based practice. METHODS: Forty-two consecutive eyes with no previous surgery having thin flap laser in situ keratomileusis with the Moria LSK-One manual microkeratome had a new 100 microm (predicted flap thickness) head used for flap creation. Flap thickness was measured intraoperatively by subtraction ultrasound pachymetry (difference between central corneal thickness before flap cutting and residual stromal bed thickness after flap lifting). Vertical flap diameter and nasal hinge length were measured with calipers. RESULTS: Mean flap thickness was 107 microm +/- 14 (SD) (range 82 to 137 microm). Standard deviation for mean vertical flap diameter was +/-0.24 mm. The cord length of the nasal hinge was variable with a mean of 4.26 +/- 0.63 mm (range 3.12 to 5.75 mm) in length. Postoperatively, there were no slipped flaps, flap striae, diffuse lamellar keratitis, or epithelial defects; there was 1 epithelial slide. At 1 day, the visual acuity was 20/20 or better in 76% of eyes. CONCLUSIONS: The 100 microm head of the Moria LSK-One manual microkeratome cut a very predictable flap thickness and diameter but with variable length hinges. This flap thickness predictability was superior to that in other series with thicker intended flaps cut with mechanical microkeratomes and is comparable to that reported with the IntraLase FS femtosecond laser. Visual recovery was rapid, epithelial risks minimal, efficiency superior, and cost nominal relative to femtosecond laser technology.     

适合中原人眼的Moria M2角膜板层刀参数选择

目的：研究适合中原人眼的Moria M2旋转式角膜板层刀有关参数的选择,以制作理想的角膜瓣。 方法：收集2009-11/2012-02在邢台市眼科医院准分子激光近视治疗科行LASIK的近视患者300例594眼,均来自中原地区,其中男154例305眼（51.35%）,女146例289眼（48.65%）。术前平均角膜曲率40～47D,手术制瓣应用法国Moria公司生产的M2旋转式角膜板层刀,对于不同的角膜曲率、采用不同的吸环和刀止位置情况下进行制瓣,分别测量角膜直径、角膜瓣直径和蒂的宽度,并对其进行比较。数据采用SPSS 13.0统计软件,进行两样本均数比较的t检验。 结果：患者来源分布：河北邢台101例（33.67%）、河北邯郸56例（18.67%）、山东聊城31例（10.33%）、山西长治23例（7.67%）、河南安阳48例（16.00%）、河南濮阳16例（5.33%）、河南鹤壁25例（8.33%）。角膜直径平均值为11.35±0.25mm,角膜瓣直径平均为8.83±0.47mm,角膜瓣蒂宽平均为4.28±0.82mm。蒂宽度与角膜瓣直径均呈正相关（r=0.732,P＜0.05）。在相同曲率和刀止位置的情况下,角膜瓣的直径与蒂的宽度呈正相关（r=0.672,P＜0.05）,角膜瓣的直径和吸环号呈负相关（r=-0.865,P＜0.05）。在相同吸环和刀止位置的情况下,角膜瓣的直径和角膜曲率呈正相关（r=0.785,P＜0.05）,蒂的宽度和角膜曲率呈正相关（r=0.659,P＜0.05）。在相同曲率和吸环的情况下,蒂的宽度和刀止位置呈负相关（r=-0.887,P＜0.05）。 结论：中原人角膜普遍较外国人小,LASIK手术时可参考适合中原人眼的Moria M2角膜板层刀的数据表。     

Evaluation of corneal flap dimensions and cut quality using a manually guided microkeratome

BACKGROUND: To evaluate reproducibility of corneal flap dimensions and cut quality with repeated blade use with a manually guided microkeratome in pig eyes. METHODS: Corneal flaps were created using a manually guided microkeratome (Model One, Moria) with an intended 130-microns cut depth in 130 enucleated pig eyes. Flap thickness was calculated by pachymetry and diameter was estimated by means of applanation lenses compared to planimetry. Histology and scanning electron microscopy of samples and blades were performed to evaluate the keratectomy surface and blade cutting edge after repeated use of the blades. RESULTS: Mean flap central thickness was 135 microns (SD, 37 microns). The mean diameter of 8.4 mm (SD, 0.4 mm) correlated significantly (P < .001) to the intended diameter (r = .79). Mean difference from the intended diameter was 0.8 mm (SD, 0.3 mm; range, 0.04 to 1.4 mm). Scanning electron microscopy showed even and smooth cuts with chatter lines at the keratectomy edge using new blades. After repeated blade use, increasing cut irregularity, folds, and tissue remnants on the corneal bed surface, and nicks and tissue remnants at the cutting edge of the blades were observed. CONCLUSION: Reproducible flap dimensions were obtained using the Moria One microkeratome on pig eyes. The cut surface was regular and smooth with a new blade, but surface quality deteriorated considerably after repeated use of the same blade.