Focus: An ocular health blog
The foundational issue for bifocal, trifocal, and multifocal failure is that the static lens systems are replacing a previously dynamic system. Accommodation is a dynamic process allowing the eye to auto focus for any given distance within three feet. The eye ultimately looses that ability at the approximate age of 45 resulting in a static, nonchanging power compromising vision at computer and reading distances. Glasses lenses are static systems without the ability to change at any given distance thus a prescription that works for 40 cm will not be clear at 2 meters.
The key to making the multifocal lens work properly is to format the needed optical powers into a functional lens system consistent with the individual demands of each patient’s working environment. This can be difficult given the visual demands of each patient are different necessitating a personalized approach to assigning not only lens powers but also lens designs. Fortunately there are many new technologically advanced multifocal designs and with proper attention to the patients working environment, a successful solution can be achieved.
At Jury Eye Care we take the time to evaluate your individual needs and assign a lens that works best for each individual need. The primary objective is to establish a single lens system that achieves multiple tasks thus eliminating the need for multiple glasses. New technology such as digital progressive lenses has opened the door to options not previously available to resolve bifocal, trifocal, and multifocal problems. View our products for more information on specific lens technology.
Keratoconus is a degenerative eye condition affecting the cornea which is the front surface of the eye responsible for focusing or converging the light and images through the eye. Keratoconus occurs when the cornea losses structural rigidity due to thining, resulting in areas of bulging. The bulging is the result of the naturally
occurring pressure of the eye pushing the weak area of the cornea forward with the subsequent affect of distorting the cornea and causing vision loss. The cause is unknown but possibly related to genetics and/or environmental factors. Statistically 1 in 500 people are affected by this condition. Many people are undiagnosed and simply live with vision loss not realizing there are options to restore vision.
Restoration of Vision
After a successful diagnosis of keratoconus, vision is restored with a rigid contact lens which redefines or replaces the flawed optical system of the keratoconic patient. Scleral lenses are the most recent technological means of restoring vision and often result in vision improvement far superior to conventional contact lenses or glasses. The scleral lens is a rigid contact lens but different from conventional rigid or gas permeable contact lenses in that it does not move on the surface of the eye thus greatly reducing mechanical discomfort. The improved lens stability provides a more comfortable and versatile wearing experience.
Treatment of Keratoconus
The visual effects of keratoconus usually begin to occur between the ages of 18 and 30 with progression over the course of 15 years. Historical treatment of the eye condition is surgical transplant of the cornea performed at an advanced stage. Corneal Collagen Cross Linking (CXL) is the latest treatment modality for keratoconus. CXL is a one hour procedure that involves four steps.
- prepare the cornea for better absorption of riboflavin
- drops of riboflavin over the course of 30 minutes
- UV light to activate the riboflavin
- bandage contact lens to be worn for a couple of days.
Activation of the riboflavin strengthens the connective tissue in the weakened areas of the cornea reducing the progressive bulging of the surface. It is performed to reduce progression so earlier detection and treatment is recommended. The procedure has been performed extensively in Europe with various studies indicating it’s efficacy.
Unfortunately, health insurance does not recognize the procedure in the United States so it is an out of pocket expense.
Contact lens wearers often experience "dryness" following limited wear of contact lenses. The sensation of dryness can be caused by four possible problems.
- Inadequate Contact Lens Fit - This usually occurs secondary to the contact lens fitting too tight without adequate fluid exchange under the plastic resulting in dryness of the corneal surface.
- Excess Depositing - Depositing on the contact lens results in a hydrophobic surface causing disruption of the tear film and resulting dryness.
- Inflammation - Ocular surface inflammation can be the result of infection, allergic reaction, or toxic reaction to preservatives in contact lens storage solutions. The inflammation causes swelling of the mucous lining over the white part of the eye resulting in the contact lens fitting too tight thus poor fluid exchange under the lens.
- Poor Tear Volume - This is the true dry eye problem and ironically the least likely cause of dryness sensation. This is the result of dysfunctional ocular surface oil glands or reduction of fluid from the lacrimal gland.
My experience is that 70% of dry eye symptoms for contact lens wearers is the result of inadequate contact lens fit. This problem can usually be resolved by adjusting the fitting parameters of the contact lens. For a consultation on the fit of your contact lenses, contact us today.
20% Off Glasses and Contact Lenses
In celebration of another successful year, we want to help you optimize your flex spending accounts. Come in today and get 20% off your next pair of glasses or contact lenses. Contact a location near you for details about this special promotion.
926 E Douglas Ave., Wichita, KS
2701 N Rock Road, Ste 200, Derby, KS
2381 N. Kansas, Liberal , KS