Effect of Intraocular Lens Power Calculation Formula Optimization in the Sum-of-Segments Optical Biometer.

Purpose: We evaluated the effect of optimization of the intraocular lens (IOL) power calculation formula SRK/T and Barrett Universal II (BU II) in long eyes (≥26 mm: group L) and short eyes (≤22 mm: group S) using axial length calculated from segmented refractive indices (SRI).

Setting: Multicenter study at five sites in Japan.

Design: Retrospective observational study.

[Long-term observation of two cases of enhanced S-cone syndrome].

Background: We report two cases of enhanced S-cone syndrome (ESCS), one in a patient observed for 20 years since age 31 and the other in an elderly patient with ESCS who underwent cataract surgery.

Case Report: Case 1. A 31-year-old man complained of night blindness and decreased vision.