\(power \ of \ a \ lens \ (D) = \frac{1}{focal \ length \ (m)}\) A lens has a power of -3.33 dioptres. Calculate the focal length and state what type of lens it is.

Once the IOL formula has been chosen; the corneal power, axial length, white-to-white, ACD and lens thickness have been measured; age and current refraction have been determined; and the desired ...

Not all IOLs that are labeled as +20 D will provide the same postoperative refractive result, even if used in identical eyes. The reason is that while the lens power may actually be +20 D when ...