In:
Acta Ophthalmologica Scandinavica, Wiley, Vol. 85, No. s240 ( 2007-09), p. 0-0
Abstract:
Purpose: The new ATD perimetry assesses contrast sentivity thresholds for the three afferent sensory pathways of the visual system. Our aim is to compare contrast sensitivity to stimuli with different spatio‐temporal frequencies in glaucomatous (G) and ocular hypertensive (OHT) subjects. Methods: Twenty three G and OHT subjects were selected from the ophthalmic clinic, all subjects signed an informed consent. Inclusion criteria were diagnosis of G or OHT, normal Farnsworth‐Munsell color test, ametropia less than 6 D, visual acuity over 20/30, absence of previous ocular surgery and experience in perimetry. Twenty locations and the fovea were evaluated in a 60º x 40º fovea‐centered field. Eight gabor stimuli were used: 0.5cpd‐12Hz, 0.5cpd‐24Hz, 4cpd‐2Hz and 4cpd 12Hz, modulated along the achromatic (A) direction, 0.5cpd‐12Hz and 4cpd‐2Hz along the red/green (T) and blue/yellow (D) directions. Statistical analysis included ANOVA and Schéffé tests. Results: Mean thresholds for G and OHT were respectively, 0.4872 ± 0.5323 and 0.1077 ± 0.1922, for A 0.5cpd‐12Hz; 0.7296 ± 0.5925 and 0.2280 ± 0.2246 for stimulus A 0.5cpd‐24Hz; 1.4444 ± 0.5244 and 1,2671 ± 0.6138 for A 4cpd‐2Hz; and 0.7751 ± 0.1937 and 0.6851 ± 0.2379 for D 0.5cpd‐12Hz. Significant statistical differences (p 〈 0.05) were found between G and OHT groups only with these stimuli. Conclusions: These preliminary results show that certain stimuli may differentiate between G and OHT subjects. A larger population sample, including glaucoma suspects, is currently under study.
Type of Medium:
Online Resource
ISSN:
1395-3907
,
1600-0420
DOI:
10.1111/aos.2007.85.issue-s240
DOI:
10.1111/j.1600-0420.2007.01062_3373.x
Language:
English
Publisher:
Wiley
Publication Date:
2007
detail.hit.zdb_id:
2466981-7
detail.hit.zdb_id:
2024571-3
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