Accommodative Intraocular Lenses

Who are accommodative intraocular lenses for?

Parts of the Crystalens Accommodative Intraocular Lens
Parts of the Crystalens Accommodative Intraocular Lens

Potential candidates for accommodative lenses are those who would like to enjoy good distant and intermediate vision.

Patients who use a computer every day may especially benefit from accommodative lenses.  With this technique good near vision is achieved, but dependency on spectacles is not eliminated completely for up-close tasks requiring precision. Patients with corneal astigmatism over one dioptre are not good candidates for this type of intraocular lens, as this can only be corrected with a multifocal toric lens.

The right choice depends on each patient and is a very personal decision.  Your surgeon will help you to decide which option is best for you.

How do accommodative lenses work?

To achieve clear vision at different distances after cataract surgery there are various options.  One of them is accommodative intraocular lenses.  The most well-known are called Crystalens, which are frequently implanted in the United States.  They differ from standard monofocal lenses as they also cover cataract and presbyopia treatment at the same time.

Accommodative lenses are monofocal and are implanted to correct the refractive error when viewing distant objects.  Through the muscular contraction of the ciliary body and thanks to its small hinges, they move slightly inside the capsular sac, simulating the natural accommodation of the eye. By changing position, the lens makes the rays focus at a shorter distance from the original position, although its movement is limited.

Implanted Crystalens Accommodative Intraocular Lens
Implanted Crystalens Accommodative Intraocular Lens

What are the advantages and disadvantages of accommodative lenses?

One of the major advantages of this type of lenses is that they do not produce a halo effect or reduce sensitivity to contrast as is the case with multifocal lenses.  On the contrary, near vision is not as good as with multifocal lenses. In some cases, the use of spectacles may be necessary to see smaller letters although these lenses do considerably reduce dependency on spectacles.