作者
Guanghong Zhang,Jun Jiang,Qian Wei,Chao Qu
摘要
Abstract
Purpose
To investigate the effects of accommodation on the geometrical parameters of human lens. Methods
Eight databases from inception to November 2023 were used for the literature search: CNKI, CBM, VIP, Wan-Fang, PubMed, Web of Science, EMBASE, and the Cochrane Library. The Methodological Index for Non-randomized Studies was used to assess the risk of bias. The PRISMA were followed and the following outcomes were taken into consideration: lens diameter (LD), lens thickness (LT), anterior curvature radius (ACR), posterior curvature radius (PCR), lens center position (LCP), and total cross-sectional area (TCSA). This systematic review was registered on an international platform for registered systematic reviews and meta-analysis (INPLASY202260085). Results
A total of 19 studies were included. LT increased by 0.04 mm/D (18 studies; 95 % confidence interval [CI], 0.03–0.06; I2 = 96.6 %; P < 0.001). At the same time, LD, ACR, and PCR decreased by 0.06 mm/D (6 studies; 95%CI, −0.07–0.05; I2 = 50.1 %; P < 0.001), 0.53 mm/D (8 studies; 95%CI, −0.64–0.41; I2 = 96.5 %; P < 0.001), and 0.14 mm/D (9 studies; 95%CI, −0.19–0.09; I2 = 94.7 %; P < 0.001) during accommodation, respectively. Moreover, LCP shifted forward by 0.01 mm/D (3 studies; 95%CI, −0.02–0.00; I2 = 0.0 %; P < 0.001), and TCSA by 0.58 mm2/D (2 studies; 95%CI, 0.41–1.57; I2 = 97.0 %; P = 0.457) during accommodation. Conclusions
Changes in LT, LD, ACR, PCR and LCP supported Helmholtz's theory. Different apparatuses or measurement methods influenced the measurement of lens geometrical parameters.