Physics of vision

The eye as an optical refracting system, including ray diagrams of image formation.

Sensitivity of the eye; spectral response as a photodetector.

Spatial resolution of the eye; explanation in terms of the behaviour of rods and cones.

Defects of vision and their correction using lenses

Properties of converging and diverging lenses; principal focus, focal length and power,
\(power = \dfrac{1}{f} \); \(\dfrac{1}{u} + \dfrac{1}{v} = \dfrac{1}{f} \); \(m = \dfrac{v}{u} \)

Myopia, hypermetropia, astigmatism.

Ray diagrams and calculations of powers (in dioptres) of correcting lenses for myopia and hypermetropia.

The format of prescriptions for astigmatism.