Proclear Multifocal XR lenses by Coopervision are designed to provide the presbyopic patient with clear vision and comfort as well as maintaining good overall ocular health. The refractive error known as presbyopia occurs as a patient ages. By age 40, the ability of the eye to see objects up close begins to diminish.
This is a result of the inability of the crystalline lens to adequately flex to the point of adjusting the focal length of a near object to be seen clearly as it is relayed from the surface of the retina to the visual cortex of the brain. 1/3 of the refractive ability of the eye resides with the surface of the cornea, the remaining 2/3 is found in the accommodative reflexes of the crystalline lens.
The ability of the crystalline lens to flex to different focal points is known as the amplitude of accommodation. As we age, the suspensory ligaments responsible for the lenses ability to flex, begin to harden and become less flexible. By age 50, this reflex is nearly gone. This refractive error is known as presbyopia. To combat this problem, bifocals or multifocal contacts are prescribed by your eyecare professional. This additional power, known as the add, works in conjunction with your near-sightedness, far-sightedness and astigmatism to help you see objects up close more clearly.
Proclear Multifocal XR lenses are designed using Cooperivison’s patented Balance Progressive™ Technology. Just as each human being has a dominant hand and a non-dominant hand they use to write with, the eyes also have dominance. One eye is predominantly the purveyor of visual stimuli to the brain. This is extremely important in correcting presbyopic patients with multifocal contacts. The distance lens should always be assigned to the dominant eye, the near lens to the non-dominant eye. Otherwise, depth perception and interpretation of visual stimuli will suffer.
Proclear Multifocal XR lenses take this into account. The near and distance lenses are designed with series of concentric zones designed to assist the wear at different focal distances. This balances the patients perception of visual stimuli at different focal lengths not only providing the brain with clear and distinct images, but also balancing these images so as not to hinder depth perception and create a struggle for dominance between the dominant and non-dominant eye. Since these lenses are progressive, meaning they gradually increase in power, they are designed to work well at any focal length including an intermediate zone which is often problematic for patients who utilize computers and other digital devices.
Proclear Multifocal XR lenses also provide the patient with a modality to maintain a healthy cornea through use hydrogel and PC technology. These materials, specifically omafilcon A and phosphorylcholine, are hydrophilic meaning they absorb and attract water molecules. Maintaining the fluid environment of the corneal tear film is vital to prevent infections, irritation due to allergens and the buildup of denatured proteins. All of these problems can give rise to vision threatening disorders. This translates to better comfort for the patient as well as a healthy cornea.