What are phakic lenses?


Phakic intraocular lenses, or phakic lenses, are lenses made of plastic or silicone that are implanted into the eye permanently to reduce a person's need for glasses or contact lenses. Phakic refers to the fact that the lens is implanted into the eye without removing the eye's natural lens. During phakic lens implantation surgery, a small incision is made in the front of the eye. The phakic lens is inserted through the incision and placed just in front of or just behind the iris.

 

Are Phakic Lenses for You?


You are probably NOT a good candidate for phakic lenses if:
You are not an adult. There are no phakic lenses approved by the FDA for persons under the age of 21.
You are not a risk taker. Certain complications are unavoidable in a percentage of patients, and there are no long-term data available for phakic lenses.
You required a change in your contact lens or glasses prescription in the last 6 to 12 months in order to obtain the best possible vision for you. This is called refractive instability. Patients who are:
          in their early 20s or younger,
          whose hormones are fluctuating due to disease such as diabetes,
          who are pregnant or breastfeeding, or
          who are taking medications that may cause fluctuations in vision,
are more likely to have refractive instability and should discuss the possible additional risks with Dr. Chaffin.
 
You may jeopardize your career. Some jobs prohibit certain refractive procedures. Be sure to check with your employer/professional society/military service before undergoing any procedure.
Cost is an issue. Most medical insurance will not pay for refractive surgery.
You have a disease or are on medications that may affect wound healing. Certain conditions, such as autoimmune diseases (e.g., lupus, rheumatoid arthritis), immunodeficiency states (e.g., HIV) and diabetes, and some medications (e.g., retinoic acid and steroids) may prevent proper healing after intraocular surgery.
You have a low endothelial cell count or abnormal endothelial cells. If the cells that pump the fluid out of your cornea, the endothelial cells, are low in number relative to your age, or if your endothelial cells are abnormal, you have a higher risk of developing a cloudy cornea and requiring a corneal transplant.
You actively participate in sports with a high risk of eye trauma. Your eye may be more susceptible to damage should you receive a blow to the face or eye, such as a blow to the head during boxing or hit in the eye by a ball during baseball. Your eye may be more susceptible to rupture or retinal detachment, and the phakic lens may dislocate.
You only have one eye with potentially good vision. If you only have one eye with good vision with glasses or contact lenses, due to disease, irreparable damage, or amblyopia (eye with poor vision since childhood that cannot be corrected with glasses or contact lenses), you and Dr. Chaffin will consider the risk of possible damage and/or loss of vision to your better eye as a result phakic lens implantation.
You have large pupils. If your pupil dilates in low lighting conditions to a size that is larger than the size of the lens, you have a higher risk of experiencing visual disturbances after surgery that may affect your ability to function comfortably or normally under such conditions (e.g., while driving at night).
You have a shallow anterior chamber. If the space between the cornea and the iris, the anterior chamber, is narrow, you have a higher risk of developing complications, such as greater endothelial cell loss, due to implantation of the phakic lens.
You have an abnormal iris. If your pupil is irregularly shaped you have a higher risk of developing visual disturbances.
You have had Uveitis. If you have had inflammation in your eye, you may have a recurrence or worsening of your disease and/or may develop additional complications, such as glaucoma, as a result of surgery.
You have had problems with the posterior part of your eye. If you have had any problems in the back part of your eye or are at risk for such problems, for example, proliferative diabetic retinopathy (growth of abnormal vessels in the back of the eye due to diabetes) or retinal detachment, you may not be a good candidate for phakic lens implantation. The phakic lens may not allow Dr. Chaffin to get a clear view of the back part of your eye, preventing or delaying detection of a new or worsening problem, and/or the phakic lens may prevent or make treatment of a problem in the back of your eye more difficult.
You have glaucoma (damage to the nerve of the eye resulting in loss of peripheral and then central vision due to too high pressure inside the eye), ocular hypertension (high eye pressure), or glaucoma suspect (some indications, but not clear, that patient has glaucoma). You may have a higher risk of developing or worsening of glaucoma as a result of phakic lens implantation.
You have pseudoexfoliation syndrome (abnormal deposits of material in the eye visible on the structures in the front part of the eye, such as on the front of the natural lens and the back of the cornea). This syndrome is associated with glaucoma and weakness of the structures holding the natural lens in place (the zonules). You may have a higher risk of surgical complications and/or complications after surgery if you have this syndrome.
You have had an eye injury or previous eye surgery.
Your need for visual correction is outside the range for which the phakic lens has been approved.
You are over the age of 45 years old. Some phakic lenses have not been studied in patients over the age of 45.

 

What do they treat?


Phakic lenses are used to correct refractive errors, errors in the eye's focusing power. Currently all phakic lenses approved by the FDA are for the correction of nearsightedness (myopia).

The cornea and natural lens of the eye focus light to create an image on the retina, much like the way the lens of a camera focuses light to create an image on film. The bending and focusing of light is also known as refraction. Imperfections in the focusing power of the eye, called refractive errors, cause images on the retina to be out of focus or blurred.

People that are nearsighted have more difficulty seeing distant objects than near objects. For these people, the images of distant objects come to focus in front of the retina instead of on the retina.

Ideally, phakic lenses cause light entering the eye to be focused on the retina providing clear distance vision without the aid of glasses or contact lenses.

Surgery is not required to correct nearsightedness. You can wear glasses or contact lenses instead to correct your vision. Depending on how nearsighted you are, and other conditions of your eye, other refractive surgery (surgery to correct refractive errors) options may be available to you, including PRK (Photorefractive Keratectomy) and LASIK (Laser Assisted In-Situ Keratomileusis).

 

Can they be removed?


Phakic lenses are intended to be permanent. While the lenses can be surgically removed, return to your previous level of vision or condition of your eye cannot be guaranteed.

 

Is VERISYSE™ Phakic Intraocular Lenses FDA Approved?


Yes

 

How effective is this procedure?


Patients who choose the Verisyse lens for their Phakic Intraocular Lenses usually have been frustrated with glasses and contacts for a very long time. Their degree of near-sightedness is such that it was often difficult for them to be fitted with glasses or contacts. FDA trial data indicates the vision improvement with Verisyse is substantial.

This chart shows the vision Verisyse patients have in their first implanted eye at 3 years post-op without the use of any glasses or contacts.

Where can I get more answers about VERISYSE™ Lenses?


Apersonalized consultation with Dr. Chaffin will address all your concerns for complete information about VERISYSE™ Lenses, eye surgery and whether you are a potential candidate to receive a VERISYSE™ Lens. If you have additional questions, call our office to schedule you consultation 775.329.2300.