Open AccessThe innovativeself - adjustable Adspecs TM
Author(s) -
Anthony Carlson
Publication year - 2005
Publication title -
african vision and eye health
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.186
H-Index - 5
eISSN - 2413-3183
pISSN - 2410-1516
DOI - 10.4102/aveh.v64i1.205
Subject(s) - standard deviation , optometry , refraction , optics , visual acuity , near vision , ophthalmology , mathematics , computer science , physics , medicine , statistics
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