There are several varieties of contact lenses. The distinctive features of each offer a wide range of options. We offer a selection of all of the top contact lens brands, including Acuvue, CIBA Air Optix, Bausch & Lomb, Fresh Look and Proclear.
Soft Contact Lenses
There are three basic types of soft contact lenses.
- Disposable-wear lenses: Disposable soft lenses are intended to be discarded and replaced after they have been worn for a certain period of time. This makes them even easier to maintain than regular soft contacts. Many disposable lenses are designed for either replacement every morning, every two weeks or every month. Daily-wear disposables are worn during waking hours only, while extended-wear disposables can be worn during sleep as well.
- Extended-wear lenses: Extended-wear soft contact lenses can be worn all the time, including while sleeping. Depending on whether a person has 7-day (standard) or 30-day lenses, the lenses need to be taken out and cleaned once a week or once a month. This is done to give the eyes a rest, and reduce the risk of a corneal infection.
Rigid, gas-permeable contacts have several advantages, including the following, over soft lenses:
- Correction of a wider range of vision problems
- Sharper vision than with most soft lenses
- More oxygen flow through to the eye, reducing risk of corneal irritation
- More durability than soft lenses, and less prone to deposit buildup
Because they are much harder than flexible contacts, gas-permeable lenses take some getting used to when they are first worn. They are also more likely than soft lenses to slip off the center of the eye and require adjustment, making them an inconvenient choice for patients who play sports or participate in other vigorous activities. Most patients, however, grow accustomed to the feel of gas-permeable lenses, and are satisfied with the improvement in vision they offer.
Bifocal Contact Lenses
Bifocal contact lenses are an advanced type of lense that is an ideal option for patients diagnosed with nearsightedness or presbyopia. Bifocal contact lenses provide a clear, customized vision at all distances, eliminating the need for glasses without surgery.
Types of Bifocal Contact Lenses
Bifocal lenses are available in both soft and gas permeable materials. Some lenses can be worn as disposable contact lenses with a schedule for replacement. Types of bifocal contact lenses available may include the following:
- Alternating bifocal contact lenses
- Aspheric bifocal contact lenses
- Concentric bifocal contact lenses
Reasons to Choose Bifocal Contact Lenses
- Current vision correction is not clear
- Difficulty reading small or fine print in low lighting
- Need to read objects at a distance further away
- Eye fatigue
The best type of bifocal contact lenses can vary depending on the preference and specific needs of the patient.
Keratoconus is the gradual thinning and outward bulging of the cornea into a cone shape. This progressive eye condition usually affects both eyes by thinning the corneas from that of a normal rounded dome-shape into one that has a cone-shaped bulge. The cornea is the clear, central part of the surface of the eye. In those patients with keratoconus, the cone-shaped cornea deflects light and causes distorted vision.
Causes of Keratoconus
Although many theories have been proposed, there is no definitive cause of keratoconus. Possible causes include:
- A collagen deficiency
- Overexposure to ultraviolet rays from the sun
- Excessive eye-rubbing
- An injury to the eye
- Diseases of the eye
Symptoms of Keratoconus
Keratoconus often begins to develop in the teen years to the early 20s, although it can develop at any age. Changes in the shape of the cornea occur gradually, usually over several years. In most patients with keratoconus, both eyes eventually become affected.
Keratoconus can be difficult to detect because it usually develops very slowly. Signs and symptoms of keratoconus may include:
- Distorted and blurry vision
- Increased nearsightedness, or myopia
- Double vision
- Halos around bright lights
- Frequent changes in eyeglass prescription
- Inability to wear contact lenses
- Headaches due to eye strain
- Light sensitivity
Diagnosis of Keratoconus
After a thorough examination of the eyes, the doctor will measure the curvature of your cornea to determine whether these symptoms are a result of keratoconus. Some of the tests that will be conducted may include:
- Corneal mapping or topography
- Measurement of vision
Treatment for Keratoconus
In the early stages of keratoconus, glasses or soft contact lenses may help to correct the nearsightedness and associated astigmatism. As the condition progresses and the cornea becomes thinner, more advanced treatment is required.
To learn more about the services we provide or to make an appointment, please call our office at 718-547-2020.