What is Presbyopia?
Presbyopic people have a reduced focus-adjusting ability, their lens loses its flexibility, making it difficult to focus on close objects. During the early and middle years of life, the crystalline lens of the eye has the ability to focus both near and distant images by getting thicker for near objects and thinner for distant objects. When this ability is lost, presbyopia results.
Years ago, people with presbyopia had only one option – to wear bifocals. Not today! We have several options that may meet your needs. Dr. Kirshner will describe your options and recommend the best one for you.
Bifocal lenses come in two types, translating and concentric design. Translating bifocals work a lot like bifocal eyeglasses. They have two power segments, with an obvious line of separation between the distance correction on top and the near correction below. Your pupil looks through either one or the other, depending on whether you’re looking far or near. This mechanism works in bifocal contacts because the lenses stay in place even as your eye moves. Most bifocal lenses are gas-permeable rigid lenses.
Concentric ring-design bifocal contact lenses feature a prescription in the center and one or more rings of power surrounding it. If there are multiple rings, they alternate between the near and distance prescription. Typically, at least two rings are within your pupil area, but this varies as your pupil expands and contracts due to varying light. Concentric ring bifocal contact lenses can be made of either soft or rigid gas-permeable material.
Aspheric Multifocal Contacts
Aspheric multifocal contact lenses are similar to progressive eyeglass lenses, where the different prescriptive powers are blended across the lens. Unlike eyeglasses, however, aspheric contact lenses are simultaneous vision lenses, so your visual system must learn to select the proper prescription for the moment.
This is the only type of multifocal contact lens that can be described as “progressive.” It’s also concentric, like the concentric ring design, and it has become the most popular type of multifocal contact lens.
If bifocal or multifocal lenses do not work for you, another alternative is monovision. With monovision, you wear one contact lens with one power to correct distance vision and the other contact lens with one power to correct near vision. The distance vision lens is usually worn in your dominant eye.
While monovision may appear to be an unusual choice, most people actually accommodate well to it, and eventually don’t even notice that each eye is responsible for a different part of their vision. Because each lens has only one power, your doctor can prescribe any of the currently available spherical lenses for monovision, including all of the current disposable lens options.
Schedule a visit today to see how American Vision at the Court in King of Prussia can help you.