Assessment of Aphakic Spectacle Lenses: High Power Flatback Lenses for the Correction of Aphakia
The spectacle wearing aphakic patient has severe optical and other problems compared with most other spectacle wearers. Recently, aspheric lenses with relatively flat back surfaces have been introduced for the correction of aphakia which are claimed to (i) reduce spectacle magnification and peripheral distortion, and (ii) increase the apparent visual field. A theoretical assessment of typical aspheric planoconvex ("flatback") lenses is presented in which optimal asphericities for the solution of different aphakic lens problems is determined and a preliminary assessment of the new aphakic lenses is given. The best asphericity of correction of off-axis aberrations with foveal vision of a rotating eye is less than that for correction of peripheral visual problems. Although the new aphakic lenses have less spectacle magnification and improved cosmetic appearance relative to previous types, the amount of asphericity seems to be insufficient to markedly improve peripheral visual performance.
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|Item Type:||Journal Article|
|Additional Information:||For more information, please refer to the journal’s website (see link) or contact the author. Author contact details: email@example.com|
|Keywords:||aphakia, spectacle magnification, aspheric lens design, lens aberrations|
|Subjects:||Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300)|
|Divisions:||Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
|Copyright Owner:||Copyright 1980 Optometrists Association Australia|
|Deposited On:||17 Aug 2006|
|Last Modified:||15 Jan 2009 07:08|
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