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I. Behavioral Studies of Stimulus Deprivation Amblyopia

Gunter K. von Noorden, MD; John E. Dowling, PhD; Donald C. Ferguson, PhD

Arch Ophthalmol. 1970;84(2):206-214.

Abstract
Rhesus monkeys were visually deprived unilaterally by surgical closure of the eyelids at different ages after birth. The animals were subsequently conditioned to respond to Landolt rings in different positions to determine visual acuity. After acuity thresholds were established for the nondeprived eye, it was surgically closed; the deprived eye was opened, and the acuity of the deprived eye was measured. The results reveal that severe visual impairment without recovery was caused by lid closure during the first four weeks of life. If lid closure was performed at three months or afterwards, the deprived eye showed rapid functional recovery when the lids were reopened. The electroretinograms in two monkeys with stimulus deprivation amblyopia were normal.

Author Affiliations
Baltimore

From the Wilmer Institute of Ophthalmology, the Johns Hopkins University School of Medicine and Hospital (Drs. von Noorden and Dowling) and the Department of International Health, the Johns Hopkins School of Hygiene (Dr. Ferguson), Baltimore.

Footnotes
Submitted for publication Dec 30, 1969.

Reprint requests to the Wilmer Institute, the Johns Hopkins Hospital, 601 N Broadway, Baltimore 21205 (Dr. von Noorden).

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