Catford drum
نویسندگان
چکیده
منابع مشابه
Does the Catford drum give an accurate assessment of acuity?
Adult emmetropes and myopes were tested with the Catford drum and the results compared with subjective (Landolt C) acuity. For he emmetropes the Catford drum was found to overestimate visual acuity by a factor of approximately 4. For myopes, and emmetropes viewing through plus lenses, the discrepancies were much larger. Since the Catford drum not only overestimates acuity but will do so by a fa...
متن کاملAssessment of the Catford drum in visual acuity testing and its use as a measurement of visual performance in low-vision patients.
Objective measurements of visual acuity were determined with the Catford drum in 82 eyes of patients in our Low-Vision Clinic who typically suffered from visual loss due to macular disease. The results were compared with subjective measurements of visual acuity by the Snellen chart. The findings indicated a significant overestimation of Snellen visual acuities by the Catford drum in 90.2% of ey...
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ژورنال
عنوان ژورنال: British Journal of Ophthalmology
سال: 1982
ISSN: 0007-1161
DOI: 10.1136/bjo.66.4.275-a