Substandard acuity in the healthy looking eye

With proper spectacle correction, the healthy human eye is capable of seeing 20/20. Common causes of reduced vision, such as cataracts and macular degeneration, are easily detected during routine examination. In many cases, however, patients present with reduced vision for which no obvious etiology is immediately apparent. This paper deals with the most common of such presentations. Entities to be discussed include amblyopia, hysteria/malingering, monofixation syndrome, partial albinism, subtle macula disease, and occult optic nerve disease.