Reduced eye - conditional, greatly simplified optical system used instead of the optical system of the normal human eye for settlements on physiological optics and practical ophthalmology. To this end, Gullstrand (A. Gullstrand) was proposed schematic eyes, consisting of the same number refractive media and surfaces that and optical eye, but with a mean value for each of its constituent elements. However, calculations using schematic eyes very complex. So we were offered a more simplified optical scheme is reduced eye, which is one of the refractive surface and one refracting medium. Of these schemes is the most accurate is reduced eye proposed C. K. Verbitsky, as can be seen from the comparison of some value for schematic eyes of Gullstrand and R., proposed by some authors (see table).
| Elements of optical system | Schematic eyes of Gullstrand | Reduced eye | |||
| Listing | on Donders | on Gullstrand | on Verbitsky | ||
| Refracting force in diopters The eye length in mm Refractive index The radius of curvature in mm: cornea the surface of the retina |
58,64 24,0 1,34 7,7 10,5 |
65,93 19,6 1,33 5,1 8,6 |
66,67 19,3 1,33 5,0 8,4 |
58,48 22,2 1,33 5,7 5,7 |
58,82 23,4 1,4 6,8 10,2 |
