Diagnosis of eccentric fixation using a calibrated ophthalmoscope: defining clinically significant limits

Citation
M. Cleary et Cm. Thompson, Diagnosis of eccentric fixation using a calibrated ophthalmoscope: defining clinically significant limits, OPHTHAL PHY, 21(6), 2001, pp. 461-469
Citations number
30
Categorie Soggetti
Optalmology
Journal title
OPHTHALMIC AND PHYSIOLOGICAL OPTICS
ISSN journal
02755408 → ACNP
Volume
21
Issue
6
Year of publication
2001
Pages
461 - 469
Database
ISI
SICI code
0275-5408(200111)21:6<461:DOEFUA>2.0.ZU;2-K
Abstract
Visuscopy and other ophthalmoscopic methods are widely applied in the asses sment of fixation behaviour in amblyopia, although the reliability and inte r-examiner variability of this test has not been established. Typically ecc entric fixation is diagnosed solely on the basis of retinal position, but t his fails to address the accompanying sensorimotor adaptations. A double-bl ind (masked) trial of a paediatric population was undertaken (n = 30, age r ange 3 years 9 months to 11 years, mean 5.6 +/- 1.5 years), involving three examiners applying a detailed protocol. The criteria for eccentric fixatio n were established from the non-amblyopic eyes. The most reliable criterion for the diagnosis of fixation was established from the results of the stud y. No single parameter proved 100% reliable, and amplitude showed greatest inconsistencies. It is recommended that a consensus of at least three param eters from position, zero retinomotor point, principal visual direction and percent foveation is required to diagnose the fixation status reliably. (C ) 2001 The College of Optometrists. Published by Elsevier Science Ltd. All rights reserved.