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Variation of Visual Acuity With Contact Lenses: A Function of Luminance

Variation of Visual Acuity With Contact Lenses: A Function of Luminance Abstract The relationship between visual acuity and luminance with contact lenses, compared with the same one obtained with glasses, shows that acuity deteriorates more rapidly with contact lenses than with glasses as luminance is decreased. Spherical aberration of the eye wearing a contact lens is shown to account for the phenomenon, as the anterior surface of the contact lens is spherical in comparison to the aspherical human cornea. With a 3 mm artificial pupil, acuity with contact lenses diminishes with luminance at the same rate as with glasses. At the lowest luminance, the difference in acuity obtained with glasses and with contact lenses is statistically significant. However, the difference is not as large as would be predicted from spherical aberration alone, because of the Stiles-Crawford effect. References 1. Bier, N.: Contact Lens Routine and Practice , ed 2, London: Scientific Publishing Co., 1957, p 129. 2. Bonnet, R.: La topographie cornéenne Paris: N Desroches, 1964, pp 173-179. 3. Ludlam, W.M., and Wittenberg, S.: Measurement of the Ocular Dioptric Elements Utilizing Photographic Methods , Amer J Ophthal 43:249-267 ( (April) ) 1966. 4. Jenkins, T.C.A.: Aberrations of the Eye and Their Effects on Vision , Brit J Physiol Opt 20:161-201 ( (July) ) 1963. 5. Ivanoff, A.: About the Spherical Aberration of the Eye , J Opt Soc Amer 46:901-903 ( (Oct) ) 1956.Crossref 6. Westheimer, C.: Aberrations of Contact Lenses , Amer J Ophthal 38:445-448 ( (Aug) ) 1961. 7. The New Improved Con-o-coid Aspheric Contact Lens presented by Obrig Laboratories at the 73rd meeting of the American Academy of Ophthalmology and Otolaryngology, Chicago, Oct 27, 1968. 8. Millodot, M.: Letter to the Editor , Amer J Ophthal 44:745-746 ( (Nov) ) 1967. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Archives of Ophthalmology American Medical Association

Variation of Visual Acuity With Contact Lenses: A Function of Luminance

Archives of Ophthalmology , Volume 82 (4) – Oct 1, 1969

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Publisher
American Medical Association
Copyright
Copyright © 1969 American Medical Association. All Rights Reserved.
ISSN
0003-9950
eISSN
1538-3687
DOI
10.1001/archopht.1969.00990020463007
Publisher site
See Article on Publisher Site

Abstract

Abstract The relationship between visual acuity and luminance with contact lenses, compared with the same one obtained with glasses, shows that acuity deteriorates more rapidly with contact lenses than with glasses as luminance is decreased. Spherical aberration of the eye wearing a contact lens is shown to account for the phenomenon, as the anterior surface of the contact lens is spherical in comparison to the aspherical human cornea. With a 3 mm artificial pupil, acuity with contact lenses diminishes with luminance at the same rate as with glasses. At the lowest luminance, the difference in acuity obtained with glasses and with contact lenses is statistically significant. However, the difference is not as large as would be predicted from spherical aberration alone, because of the Stiles-Crawford effect. References 1. Bier, N.: Contact Lens Routine and Practice , ed 2, London: Scientific Publishing Co., 1957, p 129. 2. Bonnet, R.: La topographie cornéenne Paris: N Desroches, 1964, pp 173-179. 3. Ludlam, W.M., and Wittenberg, S.: Measurement of the Ocular Dioptric Elements Utilizing Photographic Methods , Amer J Ophthal 43:249-267 ( (April) ) 1966. 4. Jenkins, T.C.A.: Aberrations of the Eye and Their Effects on Vision , Brit J Physiol Opt 20:161-201 ( (July) ) 1963. 5. Ivanoff, A.: About the Spherical Aberration of the Eye , J Opt Soc Amer 46:901-903 ( (Oct) ) 1956.Crossref 6. Westheimer, C.: Aberrations of Contact Lenses , Amer J Ophthal 38:445-448 ( (Aug) ) 1961. 7. The New Improved Con-o-coid Aspheric Contact Lens presented by Obrig Laboratories at the 73rd meeting of the American Academy of Ophthalmology and Otolaryngology, Chicago, Oct 27, 1968. 8. Millodot, M.: Letter to the Editor , Amer J Ophthal 44:745-746 ( (Nov) ) 1967.

Journal

Archives of OphthalmologyAmerican Medical Association

Published: Oct 1, 1969

References