Lens Power in Diopters
Enter your known values, leave one input blank, and solves for the missing one. Try different units for next level excitement!
Learning zone
Opticians work in reciprocal meters because powers of thin lenses in contact simply add: a +2.0 dpt reading lens stacked on a +0.5 dpt correction acts as +2.5 dpt. A prescription of −4.0 dpt for nearsightedness is a diverging lens of focal length −25 cm. The relaxed human eye is a roughly +60 dpt system, most of it contributed by the cornea rather than the adjustable lens.
Lens Power in Diopters
Where
- = Optical power
- = Focal length
Missing one of these? Work it out first, then come back
- Focal length — Thin Lens Equation, Focal Length of a Spherical Mirror