Discrimination of Blur in Normal and Amblyopic Eyes
The ability to respond and accommodate appropriately to a defocused and perceptually blurred target requires one to be able to discriminate changes in overall contrast and edge sharpness (Fry., 1955; Fujii et al, 1970; Hamerly and Dvorak, 1981; Watt and Morgan, 1983; Ciuffreda and Rumpf, 1985; Ciuf-freda et al., 1987) as well as other attributes (such as chromatic aberration, spherical aberration, etc.) of the retinal image (Fry., 1955; Campbell and West-heimer, 1959; Fujii et al., 1970). Inability to do so would adversely affect accommodative accuracy and quality of the retinal image (Fry., 1955; Fujii et al., 1970; Ciuffreda and Rumpf, 1985). This, in turn, could impair one’s visual resolution and visual efficiencY., perhaps even leading to general visual discomfort. Such results might be predicted to be found, and indeed exaggerated, in amblyopic eyes in which overall reduced sensitivity is the norm (Schapero, 1971; Ciuffreda et al., 1991).
KeywordsSpatial Frequency Retinal Image Chromatic Aberration Luminance Profile Anisometropic Amblyopia
Unable to display preview. Download preview PDF.
- Burian, H. M., and von Noorden, G. K., 1974, Binocular Vision and Ocular MotilitY., C. V. Mosby., St. Louis.Google Scholar
- Campbell, F. W., and Kulikowski, J. J., 1972, The visual evoked potential as a function of contrast of a grating pattern, J. Physiol. (Lond.) 222:345–356.Google Scholar
- Ciuflfreda, K. J., and Kenyon, R. V., 1983, Accommodative vergence and accommodation in normals, amblyopes and strabismics, in: Vergence Eye Movements: Basic and Clinical Aspects (C. M. Schor and K. J. Ciuflfreda, eds.), Butterworth, Boston, pp. 101–173.Google Scholar
- Ciuflfreda, K. J., Dul, M., and Fisher, S. K., 1987, Higher-order spatial frequency contribution to accommodative accuracy in normal and amblyopic observers, Clin. Vis. Sci. 1:219–229.Google Scholar
- Ciuflfreda, K. J., Levi, D. L., and Selenow, A., 1991, Amblyopia: Basic and Clinical Aspects, Butterworth, Boston.Google Scholar
- Duke-Elder, S., and Abrams, D., 1970, System of OphthalmologY., Vol. 5, Ophthalmic Optics and Refraction, C. V. Mosby., St. Louis.Google Scholar
- Fry, G. A., 1955, Blur of the Retinal Image, Ohio State University Press, Columbus.Google Scholar
- Fujii, K., Kondo, K., and Kasai, T., 1970, An analysis of the human eye accommodation system, Osaka Univ. Tech. Rep. 20:221–236.Google Scholar
- Hartinger, H., 1951, Uber ein neues Refraktometer, in: 57th Meeting Deutsch Optisch Gasellschaft, Munich, pp. 105–108.Google Scholar
- Krumholz, D. M., Fox, R. S., and Ciuflfreda, K. J., 1986, Short-term changes in tonic accommodation, Invest. Ophthalmol. Vis. Sci. 27:555–557.Google Scholar
- Phillips, S. R., 1974, Ocular Neurological Control Systems: Accommodation and the Near Response Triad, Ph.D. dissertation, University of California, Berkeley.Google Scholar
- Schapero, M., 1971, Amblyopia, Chilton, New York.Google Scholar