Eccentric correction for off-axis vision in central visual field loss
2003 (English)In: Optometry and Vision Science, ISSN 1040-5488, E-ISSN 1538-9235, Vol. 80, no 7, 535-541 p.Article in journal (Refereed) Published
Background. 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. Methods. 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. Results. Of the seven cases reported, five experienced an improvement in visual function in their preferred retinal locus with eccentric refraction. Conclusions. 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.
Place, publisher, year, edition, pages
2003. Vol. 80, no 7, 535-541 p.
aberrations, oblique astigmatism, central scotoma, central visual field loss, central field loss, eccentric correction, eccentric fixation, preferred retinal locus, pass resolution perimetry, peripheral-vision, human-eye, refractive error, detection acuity, central scotoma, astigmatism, targets, quality
Atom and Molecular Physics and Optics
IdentifiersURN: urn:nbn:se:kth:diva-22676ISI: 000184210000010OAI: oai:DiVA.org:kth-22676DiVA: diva2:341374
QC 20100525 NR 201408042010-08-102010-08-102012-02-14Bibliographically approved