Original Research

The innovativeself - adjustable Adspecs TM

A.S. Carlson
African Vision and Eye Health | South African Optometrist: Vol 64, No 1 | a205 | DOI: https://doi.org/10.4102/aveh.v64i1.205 | © 2005 A.S. Carlson | This work is licensed under CC Attribution 4.0
Submitted: 19 December 2005 | Published: 19 December 2005

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A.S. Carlson, Optometric Science Research Group, Department of Optometry, University of Johannesburg, PO Box 524, Auckland Park, 2006 South Africa, South Africa

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A method of self-refraction, based onan old concept implemented with the aidof modern technology, is spectacles withadjustable lenses. The spectacle design isreferred to as the AdspecsTM. The advantageof the Adspecs is that the wearer can adjustthe powers of the lenses to suit his or hervisual needs. The power is spherical andranges from −6 to 6 D. Studies were undertakenin Ghana and South Africa. Subjectswere instructed under supervision to adjustthe powers of the Adspecs as accurately aspossible to correct their vision and obtainthe best visual acuity possible. An optometristthen refracted the patients and theresults were then compared. For the righteyes, the mean stigmatic coefficient differencefor distance vision was −0.13 D andthe standard deviation 0.89 D. For the lefteyes, the mean was −0.24 D and the standarddeviation 0.91 D. For near vision, themean for the right eyes was −0.27 D andstandard deviation 1.07 D, and for the lefteyes, the mean was −0.27 D and standarddeviation 1.23 D. The standard deviationsfor the means (at distance and near) forleft eyes were slightly greater than for theright eyes.


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