Cataract Clinical Trial
Official title:
Comparison Between Bilateral Low-add Multifocal Intraocular Lenses and Monofocal Intraocular Lenses: A Randomised Trial
Compare low-add multifocal IOLs with monofocal IOLs to evaluate if patients in the low-add multifocal IOL group have better unaided distance visual acuity compared to the monofocal group.
Spectacle independence is one of the main aims in modern cataract surgery. Although bilateral
monofocal IOL implantation, aiming for emmetropia or low myopia, leads to high levels of
patient satisfaction in distance vision, spectacle dependence for intermediate vision,
reading and other near vision tasks is the usual result.
There are different techniques to reduce spectacle dependence, the most common one is the use
of multifocal IOLs. However, a variable number of patients complain of problems, such as
glare or haloes (positive dysphotopsia symptoms). Dysphotopsia symptoms may vary
significantly from patient to patient. The real incidence of dysphotopsia like symptoms after
cataract surgery and multifocal IOL is unknown and the implantation of multifocal IOLs is a
commonly accepted contraindication in patients who are night drivers. Another characteristic
of many multifocal IOLs is that it can provide patients with excellent near and distance
vision but lack in the intermediate range.
One option to enhance intermediate vision and to leave patients with good contrast
sensitivity is the use of low-add multifocal IOLs. These IOLs are adequate to expectations a
lot of patients have, who were used to have a good distance vision and who were wearing
spectacles when performing near vision tasks before surgery. Many of these patients would
prefer to keep their reading spectacles after surgery and ideally would like to function well
at distance and intermediate (60 to 80 cm - computer distance, household work…) range without
glasses.
One example of these low-add multifocal IOLs is the LENTIS Comfort MF15 with a near add of
1.50D (on IOL plane). Its single, blended transition zone works to deliver patients the same
kind of distance vision as a monofocal IOL with the addition of enhanced intermediate vision.
In particular, this design provides improved vision at a distance of 60 cm and more.
Additional key features of the Comfort IOL include good contrast sensitivity for twilight
vision, optimized depth of focus, and natural imaging quality and color sensitivity.
Especially this type of IOL may lead to more tolerance of postoperative refractive errors due
to biometry and IOL power calculation imprecision. This should result in better unaided
distance vision and therefore higher patient satisfaction after cataract surgery.
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