Technical note: A comparison of a novel direct ophthalmoscope, the Optyse, to conventional direct ophthalmoscopes.

Harle, Deacon E. ORCID: https://orcid.org/0009-0008-5888-0019, Davies, Keri, Shah, Rakhee, Hussain, Syma, Cowling, Susan, Panesar, Tejinder K., Bourton, Jonathan and Evans, Bruce J. W. 2007. Technical note: A comparison of a novel direct ophthalmoscope, the Optyse, to conventional direct ophthalmoscopes. Ophthalmic and Physiological Optics 27 (1) , pp. 100-105. 10.1111/j.1475-1313.2006.00428.x

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Abstract

Despite the current popularity of binocular indirect ophthalmoscopy, direct ophthalmoscopes are still commonly used by clinicians for fundus examination. They are considered to be expensive, however, and it has been suggested that this cost can prevent their use by healthcare professionals in developing countries. The OptyseTM Lens Free Ophthalmoscope is a novel direct ophthalmoscope, without a lens focus system, that allows for comparatively inexpensive manufacture and supply. We compared the clarity of view with the OptyseTM to that with standard direct ophthalmoscopes, over a sequential cohort of patients with a variety of refractive errors and ocular conditions. The grade of clarity of view with the OptyseTM Lens Free Ophthalmoscope was less than conventional ophthalmoscopes (Wilcoxon signed rank test, p < 0.0001). This grade of clarity of view was not associated with the ametropia of the ophthalmoscopic observation (Spearman r ≤ 0.03, p ≥ 0.28) but was with the presence of cataracts (χ2 test, p < 0.0001) with both the OptyseTM and the conventional ophthalmoscopes. Despite its limitations, the retinal view with OptyseTM was often within acceptable clinical limits suggesting that this relatively inexpensive ophthalmoscope may have a place when cost prohibits any other type of ophthalmoscope use.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Optometry and Vision Sciences
Publisher:	Wiley
ISSN:	0275-5408
Date of Acceptance:	10 April 2006
Last Modified:	18 Jan 2024 16:15
URI:	https://orca.cardiff.ac.uk/id/eprint/165214

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