1. Contrast thresholds for letter identification in retinitis pigmentosa;Alexander;Investigative Ophthalmology and Visual Science,1992
2. Spatial-frequency characteristics of letter identification;Alexander;Journal of the Optical Society of America A,1994
3. On the statistical reliability of letter-chart visual acuity measurements;Arditi;Investigative Ophthalmology and Visual Science,1993
4. Clinical grading and the effects of scaling;Bailey;Investigative Ophthalmology and Visual Science,1991
5. Ophthalmic test types;Bennett;British Journal of Physiological Optics,1965