Growth of the visual system in the African cichlid fish, Haplochromis burtoni. Accommodation

Fernald, R.D.; Wright, S.E.

Vision Research 25(2): 163-170


ISSN/ISBN: 0042-6989
PMID: 4013084
DOI: 10.1016/0042-6989(85)90109-9
Accession: 021108708

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The amplitude of accomodation as a function of fish size was measured directly and computed to discover how the accomodative process changes during growth in the African cichlid fish, H. burtoni. Accomodation is achieved by lens movement in the pupillary plane along th naso-temporal axis. Accomodative lens movement is thereby directed toward a region of retinal specialization characterized by higher density of all cell types (except rods) in H. burtoni. When relaxed the temporal retina is focused for near vision and active accomodation through lens movement adjusts the focus in the temporal retina for far vision. As the animals grows, the near and far focus points change appropriately for the fish size.