Clinical and biometric determinants of actual lens position after cataract surgery

Abstract

The AL, ACD, anterior segment depth, and WTW distance correlated with actual lens position after cataract surgery. The integration of these data in IOL formulas could help improve refractive outcomes after the surgery.

Relationship between Crystalline Lens Thickness and Shape and the Identification of Anterior Ocular Segment Parameters for Predicting the Intraocular Lens Position after Cataract Surgery

“…The predicted IOL position using the C constant was shallow when there was an increase in the LT, while the central IOL thickness position was not correlated with the LT. In a study by Plat J et al [21] in which ocular optical biometry measurements were obtained using a Lenstar LS900 (Haag-Streit, Bern, Switzerland) before and after cataract surgery, the actual IOL position was not correlated with the LT, and our results support this finding. As described above, the anterior surface of the crystalline lens moved anteriorly, whereas the posterior surface moved slightly posteriorly, with an increase in the LT. As a result, the center position of the crystalline lens (i.e., 0.50 in the C constant) shifts anteriorly; thus, the predicted IOL position using the C constant is calculated as being more anterior when there is an increase in the LT.…”

Biometric Factors Associated with the Visual Performance of a High Addition Multifocal Intraocular Lens

“…Biometrical parameters retrieved from the preoperative visit included chord mu (µ) 26 the Pentacam HR were also considered in the data analysis. The addition at the corneal plane was computed considering the dioptric power of the implanted MIOL, approximating ALP to A c c e p t e d M a n u s c r i p t 5 ELP, 28 and the Km according to the Holladay's refractive vergence formula. 12 Then, the effective addition (EA) at the spectacle plane was computed considering a vertex distance of 12 mm.…”

Through-Focus Optical Bench Performance of Extended Depth-of-Focus and Bifocal Intraocular Lenses Compared to a Monofocal Lens

“…The distance between the posterior surface of the artificial cornea and the center of the IOL was set to 4.5 mm to simulate the typical anterior chamber depth of the pseudophakic eye from corneal epithelium to the center of IOL, as reported in a previous clinical study. 5 Both the eye model and CCD camera were mounted on a XYZ translation stage for a precise alignment. The 1951 USAF resolution chart was used as the resolution target and positioned on the retinal image plane.…”