Table 1 of
Kuszak, Mol Vis 2006;
12:251-270.Table 1 of
Kuszak, Mol Vis 2006;
12:251-270.
Table 1. Average lens and fiber dimensions in adult mice, cows, frogs, and rabbits
Since lenses are almost perfect mathematical constructs, reasonable estimates of the number of fibers and growth shells in any lens were calculated from solid geometry formulas using the lens and fiber dimensions listed herein. In the "ratio of anterior surface curvature to a comparably sized sphere" row, by definition, the equatorial and polar axes of a sphere are identical or 1:1. By comparison, in an oblate spheroid, the equatorial axis is greater than the polar axis. Therefore, the ratio between the minor and major radii of a spheroid is a quantificative measure of spheroidicity. For vertebrate lenses, measures of anterior and posterior spheroidicity are required because these lenses are asymmetrical, oblate spheroids. The number of fibers in the outer shell is estimated as the circumference/average fiber broad face width. Total fiber width including narrow faces are not used because fibers are arranged in a staggered configuration within growth shells.
Parameter Mouse Bovine Frog Rabbit
------------------------------------ --------- -------- -------- --------
Adult lens diameter 2.50 17.00 3.8 11.50
Adult lens anterior minor radius 0.87 4.25 0.9 3.66
Adult lens posterior minor radius 1.08 6.29 1.37 4.71
Ratio of anterior surface curvature 0.696 0.5 0.47 0.64
to a comparably sized sphere
Ratio of posterior surface curvature 0.864 0.74 0.72 0.82
to a comparably sized sphere
Adult lens circumference (πD) 7.85 53.41 11.00 36.13
Average fiber broad face width 5.45 6.81 6.00 7.14
Approximate number of fibers in 1,441 7,842 1,833 5,060
outer shell
Approximate number of fibers in 5° 20 110 25 70
longitudinal span (circumference/72)
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