From Adaptive Optics for Vision Science
10.2.6 Field Size
A large field size is almost always advantageous. A larger size permits easier
navigation through and across the retina and reduces certain complications
in postprocessing, such as those stemming from eye motion (e.g., image registration).
Several camera- and eye-related factors, however, constrain the
field size for AO imaging. These must be carefully weighed in context with
the application and are described below.
Retinal Safety An increase in field size, while maintaining constant retinal
illumination (J/cm2) as well as (CCD) pixel sampling density (pix/cm2),
requires that the total light flux entering the eye increase as the square of the
field size diameter (i.e., proportional to the retinal area being illuminated).
Under these conditions, the number of photons per pixel is held constant.
While the total light flux incident on the retina increases as the square of the
illumination diameter, the retinal hazard does not for intermediate field sizes
(1.5 to 100 mrad or 0.09° to 5.7°). At intermediate sizes, thermal heat generated
by the light dissipates less rapidly. Specifically, the thermal maximum
permissible exposure (MPE) grows linearly with (rather than the square of)
the field size from 1.5 mrad (0.09°) to 100 mrad...
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