THE BARRETT IOL FORMULAE

The Barrett IOL Calculator offers several of the most sophisticated and accurate formulae available today

Warren Hill, M.D., Medical Director, East Valley Ophthalmology, Arizona

Barrett Universal II
Formula v1.05

For all eyes, regardless of axial length

Barrett Toric
Calculator v1.05

For correction of pre-existing corneal astigmatism with Toric IOLs

Barrett True K
Formula v2.5

For eyes with prior myopic or hyperopic LASIK/PRK/RK and keratoconus

Barrett True-K Toric
Formula v2.5

For eyes with prior myopic or hyperopic LASIK/PRK/RK and corneal astigmatism

Barrett Rx Formula
v2.5

For IOL exchange and piggy back IOLs based on refraction after cataract surgery

Hosting of these calculators is supported with a grant from the Singapore Eye Foundation.