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Investigative Ophthalmology & Visual Science, Vol 25, 782-786, Copyright © 1984 by Association for Research in Vision and Ophthalmology

ARTICLES AND REPORTS

Assessment of acuity in human infants using face and grating stimuli

SJ Harris, RM Hansen and AB Fulton

In a variety of ocular disorders, square-wave gratings yield more optimistic estimates of visual acuity than more complex stimuli such as letters. However, for clinical vision testing of preverbal patients, square-wave gratings are usually employed in conjunction with preferential looking procedures. We developed a complex stimulus--a schematic face--for use in preferential looking procedures. Using the method of constant stimuli, the acuities of 1-, 3-, and 5-month-old infants with normal eyes were estimated using schematic faces and square-wave gratings. Within each age group, thresholds for face and grating stimuli were not significantly different, but psychometric functions obtained with faces were significantly steeper than those obtained with square-wave gratings. This suggests that complex stimuli such as the schematic face could yield more precise acuity estimates than gratings in some pediatric eye patients.




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Copyright © 1984 by the Association for Research in Vision and Ophthalmology