On‐eye centration of soft contact lenses

Author:

Walther Grace1ORCID,Meyer Dawn1ORCID,Richards Josh1ORCID,Rickert Martin1,Kollbaum Pete1ORCID

Affiliation:

1. Indiana University Bloomington Indiana USA

Abstract

AbstractPurposeTo evaluate the relative positions of modern soft contact lenses (SCLs) relative to the limbus/cornea and the pupil.MethodsSixty images of the anterior eyes of 101 subjects were acquired over 10 s while participants fixated the centre of the camera lens located 33 cm in front of the eye in a well‐lit (300 lux) clinic. Custom validated image analysis software was used to locate the boundaries of the contact lenses, pupils and corneas (limbus). Horizontal and vertical relative positions of the contact lens, pupil and limbus were calculated from the fitted boundaries.ResultsThe mean (standard deviation) pupil and corneal diameters for all subjects were 3.84 mm, (0.83) and 11.97 mm (0.48), respectively. The mean [95% confidence interval] pupil centre was located 0.28 mm [0.26, 0.30] nasally and 0.07 mm [0.05, 0.10] superiorly to the corneal centre. Consistent with clinical observations, the contact lenses centred accurately relative to the corneal centre both nasally 0.04 mm [0.01, 0.07] and inferiorly −0.01 mm [−0.06, 0.03]. However, regardless of the eye, the contact lens was significantly (p < 0.001) decentred relative to the pupil centre both temporally −0.23 mm [−0.26, −0.20] and inferiorly −0.08 mm [−0.12, −0.04]. Decentration magnitudes were significantly correlated between the right and left eyes.ConclusionsSpherical SCLs centred well on the cornea but temporally and inferiorly from the primary line of sight (pupil centre), due to the differences in the location of the pupil and corneal centres. Contrary to some previous reports, there was no evidence that lens optics or material affected lens centration significantly.

Publisher

Wiley

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Reimagining approaches to solving common contact lens conundrums;Ophthalmic and Physiological Optics;2024-04-26

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