Foveal cone involvement in retinitis pigmentosa progression assessed through flash-on-flash parameters.

Abstract:

PURPOSE:To compare psychophysical Naka-Rushton parameters in retinitis pigmentosa (RP) patients and healthy controls using a flash-on-flash increment threshold paradigm, and to measure changes of these parameters with RP progression. METHODS:Sixty-six RP patients and 10 normal subjects were tested, and their maximum response (Rmax), half-saturation intensity (sigma), and slope (n) parameters were estimated. RESULTS/CONCLUSIONS:Rmax in RP patients is decreased significantly with respect to the range in normal controls and continues to decrease (0.024 log units/yr) with disease progression. The distribution of sigma in RP patients differs from that in normal subjects, showing lower values in general, but no progression. Small differences in parameter distributions among genetic or pathophysiologic RP subcategorizations were found, but these do not fulfill stricter statistical criteria required for multiple comparisons. Measurement noise, inherent in the flash-on-flash paradigm, exert considerable influence on the quality of the data, as was demonstrated through repeated measures and a Monte Carlo simulation.

authors

Dagnelie G,Massof RW

subject

Has Abstract

pub_date

1993-01-01 00:00:00

pages

231-42

issue

1

eissn

0146-0404

issn

1552-5783

journal_volume

34

pub_type

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