Can I get the light adjustable lenses for cataract surgery?
How does the LAL work?
It contains monomers that are sensitive to UV light of a certain wavelength. If there is residual refractive error 17-21 days after cataract surgery, the lens is irradiated at a targeted area which will change the refractive error.
For example, if the patient has residual hyperopia, the center of the LAL is irradiated which will deplete the monomers in that area. The non-irradiated monomers will diffuse into that area causing the lens to swell, increasing the power.
Patients undergo 3 or 4 light treatments over the course of a week or two, lasting 40–150 seconds each.
How much residual refractive error can this correct?
Up to 2 diopters of post-operative sphere and 2 diopters of residual cylinder.
Could UV light from the sun cause the lens to change power?
It could which is why the patient must wear UV-protective glasses at all times until the final lock-in is complete.
Who is a good candidate for the LAL?
It’s said to be for patients who have corneal astigmatism before surgery and who do not have macular diseases. (via)