Crystalline Lens and IOL Evaluation

All subjects underwent AS-OCT using CASIA2. The CASIA2 uses a 1310 nm swept-source laser wavelength at a frequency of 0.3 seconds, producing 16 AS-OCT images from 16 different angles and a 3-dimensional analysis of the results. Further, it automatically measures the tilt and decentration of the crystalline lens or the IOL relative to the corneal topographic axis. All subjects were measured two times under non-mydriatic conditions and two times under mydriatic conditions. A mixture of 0.5% tropicamide and 0.5% phenylephrine hydrochloride (Mydrin-P, Santen, Osaka, Japan) was used to induce mydriasis. All AS-OCT measurements were taken after at least one week passed following cataract surgery [16 (link)]. All measurements were performed by a single ophthalmologist for each subject.