Eccentric correction for off-axis vision in central visual field loss

• Published in: Optometry and vision science Vol. 80; no. 7; pp. 535 - 541
• Main Authors: GUSTAFSSON, Jörgen, UNSBO, Peter
• Format: Journal Article
• Language: English
• Published: Hagerstown, MD Lippincott Williams & Wilkins 01.07.2003
• Subjects: aberrations; Adolescent; Adult; Aged; astigmatism; Biological and medical sciences; central field loss; central scotoma; central visual field; central visual field loss; certec; Clinical Medicine; Contrast Sensitivity; detection acuity; eccentric correction; eccentric fixation; Eyeglasses; Fixation, Ocular; human-eye; Humans; Klinisk medicin; loss; Medical and Health Sciences; Medical sciences; Medicin och hälsovetenskap; Middle Aged; oblique astigmatism; Oftalmologi; Ophthalmology; pass resolution perimetry; peripheral-vision; preferred retinal locus; quality; refractive error; Refractive Errors - complications; Refractive Errors - diagnosis; Refractive Errors - therapy; targets; Treatment Outcome; Vision Disorders - complications; Vision Disorders - physiopathology; Vision, Ocular; Visual Acuity; Visual Field Tests; Visual Fields
• ISSN: 1040-5488; 1538-9235; 1538-9235
• DOI: 10.1097/00006324-200307000-00015

Subjects with absolute central visual field loss use eccentric fixation and magnifying devices to utilize their residual vision. This preliminary study investigated the importance of an accurate eccentric correction of off-axis refractive errors to optimize the residual visual function for these subjects. Photorefraction using the PowerRefractor instrument was used to evaluate the ametropia in eccentric fixation angles. Methods were adapted for measuring visual acuity outside the macula using filtered optotypes from high-pass resolution perimetry. Optical corrections were implemented, and the visual function of subjects with central visual field loss was measured with and without eccentric correction. Of the seven cases reported, five experienced an improvement in visual function in their preferred retinal locus with eccentric refraction. The main result was that optical correction for better image quality on the peripheral retina is important for the vision of subjects with central visual field loss, objectively as well as subjectively.