Abstract
Purpose:
To evaluate retinal sensitivity in patients with retinitis pigmentosa (RP) using the MP-1 microperimeter (Nidek Technologies, Italy) and Humphrey Field Analyzer (HFA).
Methods:
Ten patients (10 eyes) with retinitis pigmentosa (mean age 48,2 8,9 years) were assessed. Subjects performed one examination using the HFA (10-2 pattern) and one using the MP-1 microperimeter. All tested eyes had defects encroaching within 10° of fixation. Fixation score, central 2 and 4 degrees values and bivariate contour ellipse area (BCEA) were obtained from the MP-1. Statistical analysis was performed with Student’s t-test. Values < 0.05 were considered significant.
Results:
BCVA was 0.64 ± 0.46 logMAR; in all patients refractive errors not exceeding -1.50D sphere and −1.50D cylinder. BCEA which contained 99% fixation points was 5.58 ± 5.46 degree sq. Fixation within the 2° and 4° diameter circle were 68.9± 24,25 % and 90,7 ± 8,59 % respectively. Sensitivity values for the MP-1 (mean 4.94 ± 6.55 dB) were not significantly different from HFA values (mean 5.81 ± 6.31 dB) (p =0,056).
Conclusions:
Although there was not significant difference in retinal sensitivity between MP-1 and HFA, these two devices presented a different background luminance level and also a significant advantage of the MP-1 micro perimeter over the HFA is the capability for fixation stability quantification.
Keywords: 702 retinitis •
758 visual fields