Table 2 Calculated visual parameters
From: Pygmaclypeatus daziensis, a unique lower Cambrian arthropod with two different compound eye systems
Calculated visual parameters of the dorsal compound eyes (YKLP 11427) | |
|---|---|
Visual parameter | Value |
Aperture (lens diameter) | ~42 µm |
Field of view | ~190° |
Number of facets | ~190 covering the whole visual surface |
Interommatidial angle Δφ | ~5° (0.09 rad) |
Optimal angle of acceptance of the receptor (rhabdom) Δρ | ~4° (0.069 rad) |
‘Eye-Paramter’ p | ~3 µm rad |
Absolute Sensitivity Ŝ | ~5.2 µm2rad 2 |
Sampling frequency νs | ~5.6 rad−1 |
Calculated visual parameters of the ventral stalked eyes (YKLP 13929) | |
|---|---|
Aperture (lens diameter) | ~178 µm |
Field of view | variable, because of flexible and movable eye stalkes, circumspectant view |
Number of facets | ~20 |
Interommatidial angle Δφ | ~24° |
‘Eye-Paramter’ p | ~79 µm rad |
Absolute sensitivity Ŝ | ~312 µm2rad2 |
Sampling frequency νs | ~2.2 rad-1 |
