TY - JOUR
T1 - The monocular vertical prism dissociation test
AU - Golnik, Karl C.
AU - Lee, Andrew G.
AU - Eggenberger, Eric R.
PY - 2004/1
Y1 - 2004/1
N2 - • PURPOSE: To determine if the monocular vertical prism dissociation test can differentiate between organic and nonorganic visual loss. • DESIGN: A prospective, single-masked observational study. • METHODS: Three institutional neuro-ophthalmology practices. Group 1 consisted of 30 normal controls. Group 2 included 30 patients with known organic visual loss. Group 3 contained 35 patients with suspected nonorganic monocular visual loss. Participants were asked to describe what they saw while viewing a single Snellen letter when a 4-prism diopter base-down prism was placed in front of their better eye. Outcome was measured by whether the participant sees one or two letters with the prism in place. • RESULTS: Vision-appropriate results were given by all members of Group 1 (two images) and by all members of Group 2 (one image). Two images were seen by 31 of 35 members of Group 3, indicating nonorganic visual loss. The other 4 subjects in Group 3 saw one image; each was subsequently found to have occult pathology. • CONCLUSION: The vertical prism test quickly differentiates organic from nonorganic monocular visual acuity loss.
AB - • PURPOSE: To determine if the monocular vertical prism dissociation test can differentiate between organic and nonorganic visual loss. • DESIGN: A prospective, single-masked observational study. • METHODS: Three institutional neuro-ophthalmology practices. Group 1 consisted of 30 normal controls. Group 2 included 30 patients with known organic visual loss. Group 3 contained 35 patients with suspected nonorganic monocular visual loss. Participants were asked to describe what they saw while viewing a single Snellen letter when a 4-prism diopter base-down prism was placed in front of their better eye. Outcome was measured by whether the participant sees one or two letters with the prism in place. • RESULTS: Vision-appropriate results were given by all members of Group 1 (two images) and by all members of Group 2 (one image). Two images were seen by 31 of 35 members of Group 3, indicating nonorganic visual loss. The other 4 subjects in Group 3 saw one image; each was subsequently found to have occult pathology. • CONCLUSION: The vertical prism test quickly differentiates organic from nonorganic monocular visual acuity loss.
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U2 - 10.1016/S0002-9394(03)00865-1
DO - 10.1016/S0002-9394(03)00865-1
M3 - Article
C2 - 14700656
AN - SCOPUS:0346099257
SN - 0002-9394
VL - 137
SP - 135
EP - 137
JO - American Journal of Ophthalmology
JF - American Journal of Ophthalmology
IS - 1
ER -