This page gives details of optical calculations mentioned in the Insect Vision section of BioTech. This information
is for advanced readers as it gets rather technical. These calculations were carried out in Mathcad 7 Professional
Note here that the maximum possible spatial acuity refers to the maximum possible based on the spacing
of sensors in the eye. Rather than using spatial density of sensors, this calculation uses the more
optically meaningful measure of the angle between the sensors (the interommatidial angle is the angle
between adjacent ommatidia as measured from the centre of the imaginary sphere which the facets
covers, this sphere has a radius called the radius of curvature of the eye).