What is the difference between monofocal and multifocal intraocular lenses?

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What is the difference between monofocal and multifocal intraocular lenses?
A monofocal intraocular lens is generally designed to focus at one distance. Multifocal lenses are designed to reduce reliance on glasses at multiple distances. However, some multifocal IOLs can cause halos or reduced contrast sensitivity, so they are not suitable for everyone.

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9	How is PersonalEYES different from conventional LASIK? PersonalEYES is a personalized approach to laser vision correction. It uses individual eye measurements together with ray tracing and an AI-assisted refractive simulation system called iVatar to plan ...
8	How long should I stop wearing contact lenses before my preoperative examination? For accurate measurements, we generally recommend stopping contact lens wear for at least one week before the examination. Contact lenses can temporarily alter corneal shape and tear-film quality, aff...
7	Why is corneal thickness particularly important for a second laser procedure? An enhancement procedure removes additional tissue from a cornea that has already undergone surgery. We consider the residual stromal bed, total corneal thickness, corneal shape, and expected treatmen...
6	Can I be evaluated even if I no longer have records of my previous surgery? Yes. We can begin with your current refraction, corneal topography and tomography, eye pressure measurement, and retinal examination. Records of your original prescription, ablation depth, corneal thi...
5	How long after my first surgery should I wait before considering an enhancement? The decision is not based on a fixed waiting period alone. What matters most is whether your prescription has stabilized, whether the cornea and tear film have recovered adequately, and whether the re...
4	Can an intraocular lens still be exchanged many years after cataract surgery? An older IOL may still be exchanged, but surgery can become more challenging as adhesions develop between the lens and capsular bag over time. We compare the likely benefits and risks of exchange and ...
3	Can I be evaluated if problems develop after retinal surgery elsewhere? Yes. If you may have recurrent retinal detachment, persistent bleeding, or changes in the macula after surgery, we can examine your eye and review possible treatments. If available, please bring the d...
2	I have been told I may have retinal detachment. Where should I go? If retinal detachment is suspected or has been diagnosed, it is important to be examined promptly by an eye specialist who can assess the retina thoroughly. When choosing a clinic, check whether retin...
1	I had LASIK or LASEK years ago, but my vision has become blurry again. Can I have another procedure? A second procedure may be possible, but the first step is to identify why your vision has changed. Treatment will differ depending on whether the cause is residual nearsightedness or astigmatism, dry ...