Natural History of Conversion of Leber's Hereditary Optic Neuropathy: A Prospective Case Series.

Purpose: To illustrate the natural history of Leber's hereditary optic neuropathy (LHON).

Design: Prospective observational case series.

Participants: The Soave-Brazil pedigree of m.

Correcting Finger Counting to Snellen Acuity.

In this paper, the authors describe an online tool with which to convert and thus quantify count finger measurements of visual acuity into Snellen equivalents. It is hoped that this tool allows for the re-interpretation of retrospectively collected data that provide visual acuity in terms of qualitative count finger measurements.