目的比较个性化选择0、-0.20μm、-0.27μm三种不同球差非球面人工晶状体(intraocular lens,IOL)及其随机植入术后的视觉质量,探讨最佳矫正球差值。方法前瞻性病例对照研究。选取就诊于我科的白内障患者125例(145眼),术前使用i Trace全...目的比较个性化选择0、-0.20μm、-0.27μm三种不同球差非球面人工晶状体(intraocular lens,IOL)及其随机植入术后的视觉质量,探讨最佳矫正球差值。方法前瞻性病例对照研究。选取就诊于我科的白内障患者125例(145眼),术前使用i Trace全视觉功能分析仪测量角膜高阶像差,根据角膜球差(spherical aberation,SA)值的不同分为A、B、C三组,分别植入三种不同SA非球面IOL,对照组(D组)随机植入非球面IOL。术后3个月分析全眼及角膜的高阶像差、调制传递函数(modulation transfer function,MTF)、斯泰尔比值(Strehl ratio,SR)、最佳矫正视力(best corrected visual acuity,BCVA)。结果 (1)手术前后角膜SA差异无统计学意义(P>0.05),全眼慧差(Coma)、三叶草差(Trefoil)及总高阶像差(total high order aherration,t HOA)手术前后的变化与角膜SA的变化相似。(2)三组患者BCVA差异无统计学意义(P>0.05)。(3)3 mm瞳孔直径下,四组IOL眼的角膜SA、全眼MTF t HOA及SR差异均无统计学意义(均为P>0.05);全眼SA差异有统计学意义(P=0.019),A组、B组、C组间差异无统计学意义(P>0.05),但均<D组(P=0.000)。(4)5 mm瞳孔直径下,四组IOL眼角膜SA差异无统计学意义(P>0.05);全眼SA、t HOA差异均有统计学意义(均为P=0.000),A、B、C三组间差异无统计学意义(P>0.05),但均<D组(P=0.000);全眼MTF t HOA及SR差异均有统计学意义(均为P<0.05),A、B、C三组间差异无统计学意义(P>0.05),但均>D组(P=0.000)。结论超声乳化白内障吸出术前后角膜高阶像差无差异。小瞳孔直径下,不同SA设计非球面IOL眼术后视觉质量比较无差异。大瞳孔直径下,根据术前SA个性化选择较随机植入非球面IOL眼可获得较好的视觉质量。展开更多
为了更加符合眼睛的解剖学结构,用建立的层状结构晶状体模型代替了 Hway Lan Liou眼模型中的折射率连续变化的晶状体模型,从而建立了新的眼睛模型。在这个新的层状晶状体模型中,最外层前后表面的非球面系数与解剖学数据相符。由于层... 为了更加符合眼睛的解剖学结构,用建立的层状结构晶状体模型代替了 Hway Lan Liou眼模型中的折射率连续变化的晶状体模型,从而建立了新的眼睛模型。在这个新的层状晶状体模型中,最外层前后表面的非球面系数与解剖学数据相符。由于层状结构使光线追迹具有特殊性,因此用 C语言编制了光线追迹程序,并对此眼睛模型的光学性质进行了研究。结果表明,晶状体层数较少时,眼睛的球差曲线出现翼状结构,即层状晶状体的引入使眼睛具有多焦性,并对这种现象进行了解释;具有层状结构晶状体的眼睛和具有折射率连续变化的晶状体的眼睛能够给出等价的球差结果。展开更多
With the evolution of cataract surgery from visual rehabilitation to refractive surgery, aspheric intraocular lenses(IOLs) are being increasingly used in the field of ophthalmology. This increased use can be attribute...With the evolution of cataract surgery from visual rehabilitation to refractive surgery, aspheric intraocular lenses(IOLs) are being increasingly used in the field of ophthalmology. This increased use can be attributed to negative or zero spherical aberrations with unique optical designs, which counteract some of the positive spherical aberrations of the cornea. These alterations reduce the total spherical aberration of human eyes and improve the visual acuity in patients with cataract postoperatively. At present, various types of aspheric IOLs are used worldwide. Although the implantation of aspheric IOL is beneficial to the patients who need correction of spherical aberrations, much controversy is still associated with ocular residual spherical aberrations that facilitate the best visual quality for patients postoperatively. In order to provide reference for future clinical work and scientific research, this report reviews the relationship between the ocular residual spherical aberration of human eyes and visual quality.展开更多
AIM: To compare the visual and optical performance of eyes with different corneal spherical aberration (SA) implanted with spherical aberration-free intraocular lens (IOLs). METHODS: Thirty-six patients with different...AIM: To compare the visual and optical performance of eyes with different corneal spherical aberration (SA) implanted with spherical aberration-free intraocular lens (IOLs). METHODS: Thirty-six patients with different corneal SA had phacoemulsification with implantation of spherical aberration-free IOLs. Patients were divided into 3 groups according to the value of preoperative corneal SA. Eyes with corneal SA <0.10 mu m were assigned to group A, those with 0.10 <= corneal SA <0.20 mu m to Group B, and those with 0.20 <= corneal SA <0.35 mu m to Group C. Best-corrected visual acuity (BCVA), contrast sensitivity, corneal SA, total ocular aberrations, and depth of focus were recorded 3 months postoperatively. Distance-corrected near and intermediate visual acuity was studied to measure depth of focus. RESULTS: BCVA and contrast sensitivity were similar between groups. There were no significant differences in distance-corrected near or intermediate visual acuity. Corneal SA was similar before and 3 months after surgery in the 3 groups. With a 5.0mm pupil diameter, root mean square values for total ocular higher-order aberrations (HOAs) were lower in groups A and B than in group C. Total ocular SA was lower in group A than in groups B and C. SA was also lower in group B than in group C. Coma and trefoil were similar between the groups. CONCLUSION: Implantation of spherical aberration-free IOLs in eyes with different corneal SA results in similar visual performance at BCVA, contrast sensitivity and depth of focus.展开更多
文摘目的比较个性化选择0、-0.20μm、-0.27μm三种不同球差非球面人工晶状体(intraocular lens,IOL)及其随机植入术后的视觉质量,探讨最佳矫正球差值。方法前瞻性病例对照研究。选取就诊于我科的白内障患者125例(145眼),术前使用i Trace全视觉功能分析仪测量角膜高阶像差,根据角膜球差(spherical aberation,SA)值的不同分为A、B、C三组,分别植入三种不同SA非球面IOL,对照组(D组)随机植入非球面IOL。术后3个月分析全眼及角膜的高阶像差、调制传递函数(modulation transfer function,MTF)、斯泰尔比值(Strehl ratio,SR)、最佳矫正视力(best corrected visual acuity,BCVA)。结果 (1)手术前后角膜SA差异无统计学意义(P>0.05),全眼慧差(Coma)、三叶草差(Trefoil)及总高阶像差(total high order aherration,t HOA)手术前后的变化与角膜SA的变化相似。(2)三组患者BCVA差异无统计学意义(P>0.05)。(3)3 mm瞳孔直径下,四组IOL眼的角膜SA、全眼MTF t HOA及SR差异均无统计学意义(均为P>0.05);全眼SA差异有统计学意义(P=0.019),A组、B组、C组间差异无统计学意义(P>0.05),但均<D组(P=0.000)。(4)5 mm瞳孔直径下,四组IOL眼角膜SA差异无统计学意义(P>0.05);全眼SA、t HOA差异均有统计学意义(均为P=0.000),A、B、C三组间差异无统计学意义(P>0.05),但均<D组(P=0.000);全眼MTF t HOA及SR差异均有统计学意义(均为P<0.05),A、B、C三组间差异无统计学意义(P>0.05),但均>D组(P=0.000)。结论超声乳化白内障吸出术前后角膜高阶像差无差异。小瞳孔直径下,不同SA设计非球面IOL眼术后视觉质量比较无差异。大瞳孔直径下,根据术前SA个性化选择较随机植入非球面IOL眼可获得较好的视觉质量。
文摘With the evolution of cataract surgery from visual rehabilitation to refractive surgery, aspheric intraocular lenses(IOLs) are being increasingly used in the field of ophthalmology. This increased use can be attributed to negative or zero spherical aberrations with unique optical designs, which counteract some of the positive spherical aberrations of the cornea. These alterations reduce the total spherical aberration of human eyes and improve the visual acuity in patients with cataract postoperatively. At present, various types of aspheric IOLs are used worldwide. Although the implantation of aspheric IOL is beneficial to the patients who need correction of spherical aberrations, much controversy is still associated with ocular residual spherical aberrations that facilitate the best visual quality for patients postoperatively. In order to provide reference for future clinical work and scientific research, this report reviews the relationship between the ocular residual spherical aberration of human eyes and visual quality.
基金Science and Technology of Wenzhou City,China(No.Y20100040)
文摘AIM: To compare the visual and optical performance of eyes with different corneal spherical aberration (SA) implanted with spherical aberration-free intraocular lens (IOLs). METHODS: Thirty-six patients with different corneal SA had phacoemulsification with implantation of spherical aberration-free IOLs. Patients were divided into 3 groups according to the value of preoperative corneal SA. Eyes with corneal SA <0.10 mu m were assigned to group A, those with 0.10 <= corneal SA <0.20 mu m to Group B, and those with 0.20 <= corneal SA <0.35 mu m to Group C. Best-corrected visual acuity (BCVA), contrast sensitivity, corneal SA, total ocular aberrations, and depth of focus were recorded 3 months postoperatively. Distance-corrected near and intermediate visual acuity was studied to measure depth of focus. RESULTS: BCVA and contrast sensitivity were similar between groups. There were no significant differences in distance-corrected near or intermediate visual acuity. Corneal SA was similar before and 3 months after surgery in the 3 groups. With a 5.0mm pupil diameter, root mean square values for total ocular higher-order aberrations (HOAs) were lower in groups A and B than in group C. Total ocular SA was lower in group A than in groups B and C. SA was also lower in group B than in group C. Coma and trefoil were similar between the groups. CONCLUSION: Implantation of spherical aberration-free IOLs in eyes with different corneal SA results in similar visual performance at BCVA, contrast sensitivity and depth of focus.
