Deprivation Myopia and Emmetropization
We pointed out in Chapter 6 that the eyeball grows in most people to be the correct size for the image to be in focus on the retina. This process is called emmetropization. Many infants are born hyperopic, and become emmetropic by 2–3 years of age. Some are born emmetropic and become myopic with age; that is, their eyeballs are too large for the power of the lens and the cornea, so that the image falls in front of the retina. A few are born myopic, and this is a condition that needs to be reversed early, because the eyeball can grow, but it cannot shrink.
KeywordsDopamine Retina Refraction Nism Tempo
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- Fitzke, F. W., Hayes, B. P., Hodos, W., Holden, A. L., and Low, J. C., 1985, Refractive sectors in the visual field of the pigeon eye, J. Physiol. (London) 369:33–44.Google Scholar
- Hung, L. F., Smith, E. L., and Crawford, M. L. J., 1994, Infant monkey eyes can grow to compensate for an optically induced anisometropia, Invest. Ophthalmol. Vis. Sci. 35(Suppl.):1805.Google Scholar
- Nathan, J., Kiely, P. M., Crewther, S. G., and Crewther, D. P., 1985, Disease-associated visual image degradation and spherical refractive errors in children, Arch. Ophthalmol. 62:680–688.Google Scholar
- Troilo, D., 1990, Experimental studies of emmetropization in the chick, in: Myopia and the Control of Eye Growth (G. R. Bock and K. Widdows, eds.), Wiley, New York, pp. 89–102.Google Scholar
- Wildsoet, C. F., and Pettigrew, J. D., 1988, Experimental myopia and anomalous eye growth patterns unaffected by optic nerve section in chickens: Evidence for local control of eye growth, Br. J. Ophthalmol. 3:99–107.Google Scholar