TY - JOUR
T1 - An analysis of the effect of intravitreal blood on visual acuity
AU - Thompson, John T.
AU - Stoessel, Kathleen M.
N1 - Funding Information:
From the Yale Department of Ophthalmology and Visual Science, New Haven, Connecticut. This study was supported by the Connecticut Lions Eye Research Foundation (Dr. Thompson). This study was presented in part at the annual meeting of the Association for Research in Vision and Ophthalmology, Sarasota, Florida, May 5, 1987.
PY - 1987/10/15
Y1 - 1987/10/15
N2 - We investigated the effect of diffuse hemorrhage on Snellen visual acuity in a model of vitreous hemorrhage in phakic and aphakic eyes. Two cylindrical test chambers with optical paths of 17 mm and 23 mm were constructed to simulate the effect of vitreous hemorrhage in phakic and aphakic eyes. The visual acuity was measured in two subjects in a double-masked fashion for 17 dilutions of whole blood between 1 100 and 1 12,800. The visual acuity decreased approximately linearly between the 1 800 and 1 4,800 dilutions of blood. The visual acuity was 20 20 in all dilutions of blood higher than 1 4,800. The visual acuity was reduced to hand motions or worse with 12.5 μl of blood in the 5-ml test chamber under all test conditions. The visual acuity was 20 20 in all tests with 1.04 μl of blood in the test chamber. The visual acuity decreased from 20 20 to hand motions with only a twelve-fold change in concentration of blood in the test chamber.
AB - We investigated the effect of diffuse hemorrhage on Snellen visual acuity in a model of vitreous hemorrhage in phakic and aphakic eyes. Two cylindrical test chambers with optical paths of 17 mm and 23 mm were constructed to simulate the effect of vitreous hemorrhage in phakic and aphakic eyes. The visual acuity was measured in two subjects in a double-masked fashion for 17 dilutions of whole blood between 1 100 and 1 12,800. The visual acuity decreased approximately linearly between the 1 800 and 1 4,800 dilutions of blood. The visual acuity was 20 20 in all dilutions of blood higher than 1 4,800. The visual acuity was reduced to hand motions or worse with 12.5 μl of blood in the 5-ml test chamber under all test conditions. The visual acuity was 20 20 in all tests with 1.04 μl of blood in the test chamber. The visual acuity decreased from 20 20 to hand motions with only a twelve-fold change in concentration of blood in the test chamber.
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U2 - 10.1016/0002-9394(87)90224-8
DO - 10.1016/0002-9394(87)90224-8
M3 - Article
C2 - 3661644
AN - SCOPUS:0023229498
SN - 0002-9394
VL - 104
SP - 353
EP - 357
JO - American journal of ophthalmology
JF - American journal of ophthalmology
IS - 4
ER -