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Austin Roorda, David R. Williams; Optical fiber properties of individual human cones. Journal of Vision 2002;2(5):4. doi: 10.1167/2.5.4.
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© 2015 Association for Research in Vision and Ophthalmology.
The tuning properties of the ensemble of cone photoreceptors is due to the tuning properties of individual cones convolved with the disarray in pointing direction between the cones. We used direct imaging with the Rochester adaptive optics ophthalmoscope to directly image these properties in individual cones in living human eyes. We found that cone disarray is very small, accounting for less than 1% of the breadth of the tuning function of an ensemble of cones. The implication is that the optical fiber properties of an ensemble of cones mimic the tuning properties of a single cone.
The angular tuning properties are expressed as both rho, ρ, and sigma, σ. The relationship between ρ and σ is: ρ = 0.434/2σ2. All values are the mean (+/− 1 standard deviation) of 275 cones for J.P. and 200 cones for G.Y. The correction for the size of the finite aperture of the illumination beam narrowed the cone tuning function slightly and the disarray nearly doubled after correction for optical blur and noise.
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