Preferential Hyperacuity Perimetry (PHP)

A Method of Early Detection of AMD Progression by Dan Roberts Carl Zeiss Meditec, Inc. has developed a device that is proving to be an effective tool for early detection of age-related macular degeneration (AMD). Called the PreView PHP™ (Preferential Hyperacuity Perimetry), it identifies deviations in the retina using a vision test based upon the [Read More]

Lighting For Low Vision

by Dan Roberts with supporting information by Roy Cole, O.D. (Updated February 2, 2018) What is the best kind of lighting for visually-impaired people? Is one kind of lamp better than another? These are two of the most-asked questions in a subject field that can be confusing at best. The bottom line is that people [Read More]