ERIC Number: ED174328
Record Type: Non-Journal
Publication Date: 1979-Mar
Reference Count: N/A
A Developmental Model of Infant Visual Accommodation.
Banks, Martin S.; Leitner, Edward F.
This paper reports the major findings and interprets the results of longitudinal and cross-sectional exPeriments concerning the development of visual accommodation in infants 1 to 3 months of age. The stimulus was a high-contrast, random checkerboard which was presented at three different distances from the infants (25, 50 or 100 cm). The physical size of the target was varied from distance to distance. A form of dynamic retinoscopy was used to determine the distance to which the infants appeared to be focused. Results indicated that in the second and third months improvement in visual accommodation had occurred. Validity of results were checked in a second experiment with a different procedure. Results agreed with those of the first experiment. Some accommodative capability, poor and possibly stimulus dependent, was observed among 3- and 4-week-olds. The common view of accommodation as a control system hypothetically consisting of sensory and motor components is questioned. While indirect evidence suggests that the motor hypothesis is inexact, results of these studies support the sensory hypothesis. Early inability to accommodate accurately results in a large part from an inability to detect the consequences of a focusing error. Neonates and 1-month-olds appear to see equally unclearly across a range of distances. (Author/RH)
Publication Type: Speeches/Meeting Papers; Reports - Research
Education Level: N/A
Sponsor: Texas Univ., Austin.
Authoring Institution: N/A