Improvement in Accommodation and Dynamic Range of Focus After Laser Scleral Microporation: A Potential Treatment for Presbyopia.

Purpose: To examine the ocular changes in accommodation, wavefront aberrations, and dynamic range of focus (DROF) after laser scleral microporation (LSM) for treating presbyopia.

Methods: Four presbyopic aged cynomolgus macaques (>13 years; n = 8 eyes) were included. All eyes received LSM with erbium: yttrium-aluminum-garnet laser.

Corneal melt of incisions overlying corneal ring segments: case series and literature review.

Purpose: : To describe 4 cases of corneal melt encountered after insertion of intrastromal corneal ring segments (ICRS) for ectasia, propose a theory as to the etiology of the melt, and review relevant literature.

Methods: : Retrospective observational case series. Eyes with corneal melt after ICRS implantation were identified and the charts were reviewed.

How keratoconus influences optical performance of the eye.

Using a statistical description of keratoconus (KC) topography, schematic eye models of various KC conditions are constructed to study their optical influence on visual performance. The cone shape, protruding height and extent, and distance from the visual zone are independently investigated with the three-dimensional optical eye-modeling and ray-tracing techniques. The subsequent spherical equivalent (SE), cylinder, together with residual high-order ocular aberrations, are examined and related to each separated variable.

Measuring the cornea: the latest developments in corneal topography.

Purpose Of Review: Corneal measurement uses Placido-disc topographers and tomographers, creating three-dimensional corneal models from cross-sectional images. Technology includes slit scanning, Scheimpflug imaging, very high frequency ultrasound, and high-speed anterior segment optical coherence tomography.

Recent Findings: Normative data in the Asian population using the Orbscan, and repeatability information for the 3 and 5-mm zone were reported.