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Vol. 58, No. 2, 2001
Issue release date: 2001
Brain Behav Evol 2001;58:115–120

Ostrich Ocular Optics

Martin G.R. · Ashash U. · Katzir G.
aSchool of Biosciences, The University of Birmingham, Birmingham, UK; bZemach Ostrich Syndicate, Jordan Valley, and cDepartment of Biology, University of Haifa, Oranim, Israel

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The optical structure of the eyes of ostriches (Struthio camelus; Struthionidae; Struthioniformes) was determined by the construction of a schematic eye model for paraxial optics. The eye is large (axial length = 38 mm) and of globose shape with an anterior focal length (posterior nodal distance) of 21.8 mm. The optical design of the eye is such that the lens and cornea contribute equally to its total optical power. Interspecific comparison shows that optically the ostrich eye is a larger scaled version of the eyes of common starlings (Sturnus vulgaris) and an owl (Strix aluco).

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