Abstract
The refractive state of the eye is a measure of the difference between the focal distance of the dioptric elements and the distance at which the receptors are located. If parallel rays of light incident on the pupil, as they would be when they come from an object at long distance, are brought to a point focus in the plane of the light-sensitive outer segments of the photoreceptors, the eye is said to be emmetropic. If the rays from the distant object focus in front of the receptor layer, the eye is considered myopic, or near-sighted, and only a blur would exist at the photoreceptor level. This blurred image can be brought into sharp focus by reducing the object-to-eye distance, since the image plane of a near object lies at a longer distance from the lens than that of an object farther away.
‘Sblood, there is something in this more than natural, if philosophy could find it out.
Hamlet, Act II, Sc. 2
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Baylor, E.R. (1967). Vision of Bermuda reef fishes. Nature (London) 214: 306–307.
Baylor, E.R. and Shaw, E. (1962). Refractive error and vision in fishes. Science 136: 157–158.
Beer, T. (1894). Die Accommodation des Fischauges. Pflügers Archiv. Gesamte Physiol. 58: 523–649.
Glickstein, M. and Millodot, M. (1970). Retinoscopy and eye size. Science 168: 605–606.
Meyer, D.L. and Schwassmann H.O. (1970). Electrophysiological method for determination of refractive state in fish eyes. Vision Res. 10: 1301–1303.
Munk, O. (1973). Early notions of dynamic accommodatory devices in teleosts. Vidensk. Medd. Dan Naturhist. Foren. KBH 136: 7–28.
Rochon-Duvigneaud, A. (1943). Les yeux et la vision des vertébrés. Masson, Paris.
Schwassmann, H.O. and Meyer, D.L. (1971). Refractive state and accommodation in the eye of three species of Paralabrax (Serranidae, Pisces). Vidensk. Medd. Dan Naturhist Foren KBH 134: 103–108.
Sivak, J.G. (1974). The refractive error of the fish eye. Vision Res. 14: 209–213.
Tamura, T. (1957). A study of visual perception in fish, especially on resolving power and accommodation. Bull. Jap. Soc. Sci. Fish. 22: 536–557.
Verrier, M.L. (1948). La vision des vertébrés et les théories de la vision. Ann. Biol. 24: 209–239.
Walls, G.L. (1942). The vertebrate eye and its adaptive radiation. Cranbrook Inst. Science, Bloomfield Hills, Mich., Reprint Hafner, New York 1967, 785 pp.
Wilkinson, F. (1972). A behavioural measure of grating acuity in the goldfish. Thesis, Dalhousie University, Halifax, N.S., Canada.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1975 Plenum Press, New York
About this chapter
Cite this chapter
Schwassmann, H.O. (1975). Refractive State, Accommodation, and Resolving Power of the Fish Eye. In: Ali, M.A. (eds) Vision in Fishes. NATO Advanced Study Institutes Series, vol 1. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-0241-5_26
Download citation
DOI: https://doi.org/10.1007/978-1-4757-0241-5_26
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4757-0243-9
Online ISBN: 978-1-4757-0241-5
eBook Packages: Springer Book Archive