Optical resolution Little spherical aberration Accommodation by movement of the lens (b) Optical relation: 1/f = 1/v + 1/b Focal distance f = 2,3 r (r is lens-radius) Image distance b = 2,55 r (mean vallue; Matthiessens ratio)
Retinal resolution & sensitivity Angular density: H = (2,55 – v). /360 } 2. D number / o Minimum separable = (H -1 ) 0,5 60 min of arc Unit photon catching ability (threshold value) V c = (2S d + S s ) 1,5
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