Central field perimetry of discriminated targets: I. Results for normal individuals using high-contrast targets

Purpose A new perimetry method is described to evaluate central vision under multiple hue, illumination, and contrast conditions; results are described for normal individuals using high-contrast targets. Methods For 70 normal eyes of individuals with varying age, the ETDRS chart acuity was determined as well as discriminated target perimetry using high-contrast targets presented for 250 ms at locations up to 10° eccentricity. Retesting was performed to evaluate for learning and repeatability for the thresholded acuity at each eccentricity. Results The ETDRS acuity averaged 1.15±0.37 arc min minimum angle of resolution (MAR) with best correction (20/23 equivalence). At fixation, the thresholded acuity for high-contrast targets paralleled the ETDRS acuity and averaged 1.75±0.85 arc min MAR (20/35 equivalence), and declined with increasing eccentricity in a linear fashion to 5.81±3.97 arc min (20/116 equivalent) at 10° eccentricity. Linear regression showed Vmar=1.74+0.330 * eccentricity in degrees ( R 2 =0.966, P