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Home » Eyeglasses & Contacts » Contact Lenses » Bifocal and Multifocal Contact Lenses

Bifocal and Multifocal Contact Lenses

If you are over 40 and have difficulty seeing close up, you probably have a common age-related condition called presbyopia which is when the eye’s natural lens loses the ability to focus on close objects. Presbyopia is a natural process as the eye ages and affects the majority of people from age 40 and upward.  Individuals with presbyopia are often familiar with the need to hold reading materials such as newspapers an arm’s length away from their eyes in order to see clearly, yet reading glasses with bifocal or multifocal (progressive) lenses can help.

Fortunately for those who don’t like the look, feel or inconvenience of reading glasses, there is another option. Bifocal and multifocal lenses are also available in contact lenses in both soft and Rigid Gas Permeable (RGP) varieties.

Multifocal contact lenses give you added freedom over glasses and they allow you to be able to view any direction - up, down and to the sides - with a similar vision. People wearing progressive lenses in glasses, on the other hand, have to look over their glasses if they want to view upwards or into the distance.

The Difference Between Bifocal and Multifocal Lenses

Just as the name indicates, bifocal lenses are divided into two distinct segments for different vision powers, the first for distance vision and the second for near vision.  This enables you to clearly switch your focus from near to far as needed, but your vision will not necessarily be clear in between. The term multifocal lenses can refer to any lenses with multiple powers including bifocals, trifocals or progressive lenses. Non-bifocal multifocal lenses have a range of powers that enable you to constantly adjust your focus to see clearly from up close to far and in between.

Multifocal contact lenses are generally designed in one of two ways, as either simultaneous vision lenses or alternating vision lenses.

Simultaneous vision lenses

The most popular version of multifocal contact lenses, simultaneous vision lenses present the distance and near vision zones of the lens at the same time.  Typically after a short adjustment period, your eyes learn to utilize the segment of the lens that they need to focus on the desired object and essentially ignore the other.

They come in two designs:

  • Concentric ring design: In the most basic form these are bifocal lenses that are comprised of a central circular area of one power with a ring around of the alternate power, similar to a bulls-eye.  In this design the power of the rings https://www.mansfieldtso.com/eyeglasses-contacts/?(either near or distance vision is interchangeable).  For intermediate viewing (18-24 inches away) extra rings can be added to create a trifocal or multifocal lens.  The width of each ring is variable depending on the power that is needed most and the edges of the rings can be blended for a smooth transition of focus, similar to progressive eyeglass lenses.
  • Aspheric design: These multifocal lenses attempt to provide a natural vision experience by blending many lens powers across the surface and center of the lens. In this design both distance and near vision power are located in the central visual area and your eyes will adapt to focus on the area needed to view what you are looking at.

Translating or Alternating Vision lenses

Similar to bifocal eyeglass lenses, these contacts are divided into distinct areas or zones and your pupil will move to the desired zone depending on your vision needs. Typically the top of the lens, which is what you look through when looking straight ahead is for distance vision and the bottom area (what you look through when you look down) is for near vision. However, this can be reversed according to unique vision needs.

Since contact lenses sometimes move within your eye, translating lenses are held in place by a ballast which is an area that is thicker than the rest of the lens or by truncating or flattening the bottom to stay in line by the lower lid. These lenses are only available in rigid gas permeable lens material.

An Alternative Option to Multifocal Contact Lenses: Monovision

Monovision is another contact lens alternative for presbyopia particularly if you are having

difficulty adapting to multifocal lenses.  Monovision splits your distance and near vision between your eyes, using your dominant eye for distance vision and your non-dominant eye for near vision.

Typically you will use single vision lenses in each eye however sometimes the dominant eye will use a single vision lens while a multifocal lens will be used in the other eye for intermediate and near vision. This is called a modified monovision.  Your eye doctor will perform a test to determine which type of lens is best suited for each eye and optimal vision.

Are Contact Lenses Right for You?

If you have presbyopia, contact lenses may be a great option for you. Many people prefer the look and convenience of contact lenses over traditional reading glasses. Speak to your eye doctor about the options available to you.

TARRANT COUNTY EXECUTIVE ORDER IN EFFECT 06.26.2020 6:00PM THROUGH 08.03.2020 6:00AM

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HEALTH AND SAFETY POLICY

FACE COVERING REQUIRED IN ORDER TO ENTER AND REMAIN ON PREMISIS. All persons over the age of ten (10), including employees, customers, visitors, invitees, and contractors (“patrons”), who enter this business must wear a face mask covering over their nose and mouth. The CDC advises face coverings for people 2 years or older. Face coverings may include homemade masks, scarfs, bandanas, or a handkerchief. Tarrant County residents should continue to maintain social distancing of at least six feet while outside their home.

The requirement of a face covering does not apply if covering the nose and mouth poses a significant mental or physical health risk to the individual.

SOCIAL DISTANCING PROTOCOLS. Even with the use of appropriate face
coverings, individuals should maintain six (6) feet of social distancing whenever
possible.

Employees should not work within six (6) feet of one another, except to the extent necessary to provide services.
Patrons should maintain six (6) feet of separation from other individuals outside their household, to the extent feasible when inside the business premises.
Patrons of the business queuing or waiting inside or on the premises of the business must maintain six (6) feet of separation from other individuals outside their household.

EXCEPTIONS. The requirement of a face covering also does not apply when an individual is consuming a food or beverage or receiving a service where the wearing of a face covering would impair the performance of the service.

VIOLATIONS. Patrons who do not wear a face covering will be asked to leave the premises and will not be provided goods or services until the face covering requirements are followed.

NOTICE AND SIGNAGE. Notice of this Health and Safety Policy will be posted in a conspicuous location of the business.

Thank you for your support and understanding during these unprecedented times. We hope to be able to continue to provide excellent care and service.