Reduced eye model

The reduced eye is an idealized model of the optics of the human eye introduced by Franciscus Donders. It replaces the several refracting bodies of the eye (the cornea, lens, aqueous humor, and vitreous humor) with an ideal air/water interface surface that is located 20 mm from a model retina. This, converts a system with six cardinal points (two focal points, two principal points and two nodal points) into one with three cardinal points (two focal points and one nodal point).

The reduced eye model can be used to study refractive errors such as myopia and hyperopia (near- and far-sightedness) and to simplify corrective lens computations.

References

• Diagram of the reduced eye model

"reduced eye." Millodot: Dictionary of Optometry and Visual Science, 7th edition. 2009. Butterworth-Heinemann 20 May. 2021 https://medical-dictionary.thefreedictionary.com/reduced+eye