Scale for photographic grading of vitreous haze in uveitis.

ABSTRACT:

Purpose

To validate a scale for grading vitreous haze in uveitis using digitized photographs and standardized scoring.

Design

Evaluation of clinical research methodology.

Methods

Calibrated Bangerter diffusion filters inducing incremental decrements of spatial contrast were placed in front of the camera lens while photographing a normal eye to simulate vitreous haze. The photographs were digitized and an ordinal scale was created from 0 (none) to 8 (highest level of opacification at which fundus details could be seen). The scale steps correspond approximately to decimal Snellen visual acuities of 1.0, 0.8, 0.4, 0.2, 0.1, 0.04, 0.02, 0.01, and 0.002, with approximately 0.3 log step between each step. For validation, digitized fundus photographs of uveitis patients were

SUBMITTER: Davis JL 

PROVIDER: S-EPMC3220938 | biostudies-literature | 2010 Nov

REPOSITORIES: biostudies-literature