Comparison of Two Preferential Looking Tests in the Detection of Amblyopia
Indira Geer, MSc, O.C.(C.), and Carol A. Westall, Ph.D., FAAO
Visual acuities were assessed using a letter acuity test (the Bailey-Lovie Chart) and two preferential looking tests (the Cardiff Cards and Teller Acuity Cards) in twenty-one children with strabismus. The Cardiff test is a new preferential looking test that uses familiar pictures (eg. dog, fish, house, etc.) that are vertically displaced on 21 x 28 cm cards. We found that the Teller Cards gave the highest estimates of acuity (lower logMAR scores) and the Bailey-Lovie test gave the lowest acuity estimates (higher logMAR scores) than the other two tests. There was better agreement between Bailey-Lovie and Cardiff acuity estimates than between Bailey-Lovie and Teller acuity estimates. Each of the preferential looking tests was compared with the Bailey-Lovie chart in detecting amblyopia. Of the 14 subjects identified with amblyopia by the Bailey-Lovie chart, none were identified using the Cardiff Cards and only two by the Teller Cards. We would suggest that the Cardiff Cards be used in the assessment of visual acuity in toddlers and young children who quickly become bored. However, the examiner must be aware that mild to moderate amounts of amblyopia may be missed.
© 1996 The Board of Regents of the University of Wisconsin System