Estimation of pupil size at iris plane and its magnification after cataract surgery.

IF 2.1 4区 医学 Q2 OPHTHALMOLOGY Indian Journal of Ophthalmology Pub Date : 2024-11-01 Epub Date: 2024-08-14 DOI:10.4103/IJO.IJO_544_24
Umberto Camellin, Massimo Camellin, Marcello Prantera, Roberta Di Pietro, Francesca Ponzetto, Pasquale Aragona
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Abstract

Purpose: To estimate the pupil size (at the iris plane) under photopic (P PH ) and scotopic (P S ) conditions after phacoemulsification with intraocular lens (IOL) implantation.

Methods this retrospective observational cohort study included: 190 virgin eyes from 190 patients who underwent cataract surgery with IOL implantation. Data collected with Aladdin (Topcon), AS-OCT MS-39 (CSO), and iTrace (Tracey) were SimK, mean pupillary power at 6 mm (MPP), anterior chamber depth (ACD), lens thickness (LT), axial length (AL), lens rise (LR), P PH and P S before and after surgery at 30 days, dysfunctional lens index, and opacity grade. The position of the postoperative iris plane (PIP) was measured manually with MS-39, and a multivariate regression formula was developed to predict it. Statistical analysis was performed using Statistical Package for Social Science (SPSS) (IBM).

Results: The mean and standard deviations were 42.61 ± 3.20 D for MMP at 6 mm, 3.35 ± 0.37 mm for ACD, 3.89 ± 0.18 mm for PIP ( P < 0.01), 4.55 ± 0.42 mm for LT, 0.43 ± 0.24 mm for LR, and 25.91 ± 3.03 mm for AL. The mean preoperative and postoperative topographic pupil magnification was 12% and 14.22%, respectively ( P < 0.01). Despite an increase in magnification, the postoperative pupil was smaller than the preoperative one both for scotopic and photopic conditions: The larger the preoperative pupil, the more it tends to reduce in the postoperative period.

Conclusions: Analysis of the preoperative topographic pupil alone is not sufficient for a correct indication of the optical zone and total diameter of IOL to be implanted but must be correlated with biometric data. The topographic pupil, therefore, undergoes a change in magnification from the preoperative period to the postoperative period. Furthermore, the real pupil presents a modification and, in most cases, tends to be smaller postoperatively in both photopic and scotopic conditions.

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白内障手术后虹膜平面上瞳孔大小及其放大率的估算。
目的:估计植入人工晶体(IOL)的超声乳化术后,在光镜(PPH)和散光(PS)条件下的瞳孔大小(虹膜平面):这项回顾性观察队列研究纳入了 190 名接受白内障手术并植入人工晶体的患者的 190 只原始眼球。使用 Aladdin (Topcon)、AS-OCT MS-39 (CSO) 和 iTrace (Tracey) 采集的数据包括:SimK、6 mm 时的平均瞳孔功率 (MPP)、前房深度 (ACD)、晶状体厚度 (LT)、轴向长度 (AL)、晶状体上升 (LR)、手术前后 30 天的 PPH 和 PS、晶状体功能障碍指数和混浊等级。术后虹膜平面(PIP)的位置用 MS-39 人工测量,并建立了一个多变量回归公式来预测。统计分析采用社会科学统计软件包(SPSS)(IBM):MMP在6 mm时的平均值和标准差分别为(42.61±3.20)D,ACD为(3.35±0.37)mm,PIP为(3.89±0.18)mm(P<0.01),LT为(4.55±0.42)mm,LR为(0.43±0.24)mm,AL为(25.91±3.03)mm。术前和术后地形图瞳孔平均放大率分别为 12% 和 14.22%(P < 0.01)。尽管放大率增加了,但在散光和光照条件下,术后瞳孔都比术前小:结论:术前瞳孔越大,术后瞳孔缩小的趋势越明显:结论:仅对术前瞳孔地形图进行分析不足以正确指示植入人工晶体的光学区域和总直径,还必须与生物测量数据相关联。因此,从术前到术后,地形图瞳孔的放大率会发生变化。此外,真实瞳孔也会发生变化,在大多数情况下,术后无论在光照还是散光条件下,真实瞳孔都会变小。
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来源期刊
CiteScore
3.80
自引率
19.40%
发文量
1963
审稿时长
38 weeks
期刊介绍: Indian Journal of Ophthalmology covers clinical, experimental, basic science research and translational research studies related to medical, ethical and social issues in field of ophthalmology and vision science. Articles with clinical interest and implications will be given preference.
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