Table 3. Fundus imaging lens specifications.

Specification	Value
F/#	6.4
Full field of view	12.2° (32° of visual angle)
Focal length	46.6 mm
Spectral bandwidth	920, 940 & 960 nm (relative weights 1, 2 & 1)
Working distance	≥ 10 mm
Overall length	< 100 mm
Aperture stop diameter	2.9 mm at the eye
Performance of all field angles & wavelengths	< λ/14 RMS wavefront at 0D focus < λ/10 RMS wavefront as-built at 0D focus < λ/10 RMS wavefront from −20 to +10D
Aberration correction	Afocal relay aberrations should be compensated
Camera sensor size	11.3 × 11.3 mm (5.5 μm pixel pitch)
Sensor sampling	182 pix/mm (91 lp/mm, 74 lp/deg @ eye)