Near Point & Far Point
The closest and farthest distances at which the human eye can focus objects sharply on the retina.
Governing formula
Near Point ≈ 25 cm (Normal adult eye), Far Point = ∞
SI unit
m (or cm)
In depth
Myopia (nearsightedness) brings the far point closer than infinity (corrected with concave lenses); hyperopia (farsightedness) moves the near point further than 25 cm (corrected with convex lenses).
Examples in the real world
A young adult with normal vision focusing comfortably on a book at 25 cm and stars at infinity.