Multifocal Contact Lenses

Multifocal Contact Lenses This information was adapted from the Multifocal Contact Lenses article in AllAboutVision.com’s Consumer Guide to Vision Over 40.

 

Are you over 40? If so, you may want to consider wearing multifocal contact lenses. Many people 40 and older prefer contact lenses over glasses for their active lifestyles.

Once we reach our mid-40s, presbyopia makes it difficult to focus on near objects. Reading glasses used to be the only option available to contact lens wearers who wanted to read a menu or do other everyday tasks that require good near vision.

But today, a number of multifocal contact lens options are available for you to consider. Multifocal contact lenses offer the best of both worlds: no glasses, along with good near and distance vision. Some designs can even correct for astigmatism as well as presbyopia.

Multifocal contacts are available in both soft and rigid gas permeable (RGP or GP) lens materials and are designed for daily wear or extended (overnight) wear. Soft multifocal lenses can be comfortably worn on a part-time basis, so they're great for weekends and other occasions if you prefer not to wear them on an all-day, every day schedule.

For the ultimate in convenience, one-day disposable soft multifocal lenses allow you to discard the lenses at the end of a single day of wear, so there's no hassle with lens care.

In some cases, GP multifocal contact lenses provide sharper vision than soft multifocals. But because of their rigid nature, GP multifocal contacts require some adaptation and are more comfortable if you condition your eyes by wearing the lenses every day.

Hybrid multifocal contacts are an exciting new alternative. These lenses have a GP center and a soft periphery, making it easier to adapt.

Multifocal Designs

A commonly used design is the concentric bifocal pattern. In this type of contact lens, the near correction is in a small circle at the center of the lens, surrounded by a much larger circle containing the distance correction. The distance correction could be placed in the center instead, with the near prescription in the outer ring.

Beyond this familiar configuration, the two basic multifocal contact lens designs are alternating and simultaneous image.

 Alternating image designs (also called translating designs) have distinct zones in the lens for distance vision and near vision. These designs are available in gas permeable lens materials only. Like bifocal glasses, the top part of an alternating image multifocal GP lens is for distance vision and the bottom part is for near.

When you look straight ahead while wearing an alternating multifocal, you're looking through the distance portion of the GP lens. When you look down to read, the lens remains supported by your lower lid, so your line of sight now passes through the lower (near vision) portion of the lens.

Because alternating multifocal lenses typically have just two lens powers, these lenses usually provide good vision for driving and for reading. But they may not perform as well as simultaneous image designs for computer work and other intermediate-range visual tasks.

Simultaneous image designs have distance, near and mid-range portions of the lens in front of the pupil at the same time. These designs are available in both soft and GP lens materials. Your brain must determine which area of the lens to emphasize and which area to ignore to provide the best image resolution.

Monovision

If multifocal lenses aren't comfortable or don't give you adequate vision, a monovision contact lens fitting may be a good alternative.

Monovision uses your dominant eye for distance vision and the non-dominant eye for near vision. Usually, single vision contact lenses are used for monovision. One advantage here is that single vision lenses are less costly to replace, lowering your annual contact lens expenses.

In some cases, better results can be achieved using a single vision lens on the dominant eye for distance vision and a multifocal lens on the other eye for intermediate and near vision. Other times, your eye care professional may choose a distance-biased multifocal on your dominant eye and a near-biased multifocal on the other eye. These techniques are referred to as modified monovision fits.

What if Multifocal Contacts Don't Work Out?

If your multifocal contact lenses don't work out for you, your eye care professional can return most brands to the manufacturer for a refund. But part of your contact lens fitting fee involves the time and services your eye doctor or contact lens fitter provides during the fitting and follow-up visits. This portion of your overall fitting fee usually is not refundable.

To increase your chances of success with multifocal contact lenses, it's important to manage your expectations. These lenses usually won't be able to match the clarity you get with bifocal or progressive eyeglass lenses. It's also very likely you will still need single vision eyeglasses or reading glasses for specific tasks like driving at night or reading small print.

But it's reasonable to expect multifocal contact lenses to give you very acceptable vision for 80 percent of your daily activities, and without the need for supplemental eyeglasses.


Article ©2011 Access Media Group, LLC; all rights reserved.
 

Created by Concept by dalia horn