Abstract
The ratio of axial length to corneal radius (AL/CR ratio) has a value of approximately 3.0 in emmetropia eyes, <3.0 in hyperopic eyes, and >3.0 in myopic eyes. There is evidence that in emmetropic children an AL/CR ratio greater than 3.0 indicates a risk for the development of myopia. In adult eyes, variance in the AL/CR ratio has been shown to account for as much as 93% of the variance in the eye’s refractive state. The results of 3 cross-sectional studies show that the AL/CR ratio, in emmetropic or near-emmetropic eyes, is remarkably stable with age.
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References
Stenstrom S. Investigation of the variation and covariation of the optical elements of human eyes. Transl by D Woolf. Am J Optom Arch Am Acad Optom 1948; 25: 218–232, 286-99, 340-50, 388-97, 438-49, 496-50.
Grosvenor T. Myopia in Melanesian school children in Vanuatu. In: Fledelius HC, Goldschmidt E, editors. Myopia Workshop. Copenhagen: Scriptor, 1988: 24–28.
Grosvenor T. High axial length/corneal radius ratio as a risk factor in the development of myopia. Am J Optom Physiol Opt 1988; 65: 689–696.
Sorsby A, Benjamin D, Sheridan J. Refraction and its Components during the Growth of the Eye from the Age of 3. London: Her Majesty’s Stationery Office, 1961.
Sorsby A, Leary GA. A Longitudinal Study of Refraction and its Components during Growth.. London: Her Majesty’s Stationery Office, 1970.
Goss DA, Jackson TW. Clinical findings before the onset of myopia in youth. I. Ocular optical components. Opt Vis Sci 1995; 72: 870–878.
Okamoto H. An idea for the measurement of the axial length of the eye with a laser as visual target. The correlation between the refractive error and the shape of the eye. In: Thijssen Am, Verbeek JM, editors. Ultrasonography in Ophthalmology, Proceedings of the 8th SIDUO Congress. Doc Ophthalmologica Proceedings Series 29, 1981: 205–210.
White M. The shape of the eye as the primary determinant of refractive error. University of Auckland, Auckland, NZ: unpublished manuscript, 1988.
Grosvenor T, Scott R. Role of the axial length/corneal radius ratio in determining the refractive state of the eye. Optom Vis Sci 1994; 71: 575–579.
Sorsby A, Benjamin D, Sheridan J, Davey M, Tanner J. Emmetropia and its Aberrations. London: Her Majesty’s Stationery Office, 1957.
Goss DA, Van Veen HG, Rainey BB, Feng B. Ocular optical components measured by keratometry, phakometry, and ultrasonography in emmetropic and myopic optometry students. In preparation.
Leighton DA, Tomlinson A. Changes in axial length and other dimensions of the eyeball wih increasing age. Acta Ophthalmol 1972: 50: 815–826.
Sorsby A, Sheridan J, Leary GA. Refraction, Its Components in Twins. London: Her Majesty’s Stationery Office, 1962.
Grosvenor T. Reduction in axial length with age: an emmetropizing mechanism for the adult eye? Am J Optom Physiol Opt 1987; 64: 657–663.
Ooi CA, Grosvenor T. Mechanisms of emmetropization in the aging eye. Optom Vis Sci 1995; 72: 60–66.
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© 1997 Springer Science+Business Media Dordrecht
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Grosvenor, T., Goss, D.A. (1997). The Axial Length/Corneal Radius Ratio in Emmetropia and Ametropia: A Review. In: Lakshminarayanan, V. (eds) Basic and Clinical Applications of Vision Science. Documenta Ophthalmologica Proceedings Series, vol 60. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5698-1_13
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DOI: https://doi.org/10.1007/978-94-011-5698-1_13
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