Our doctors have a wealth of experience dealing with specialty contact lens including:
- Orthokeratology or “ortho-k” for treatment of myopia (nearsightedness) control
- Keratoconus related hard contact lens fit for irregularly shaped corneas
- Rigid Gas Permeable “Hard” contact lens fit
Schedule your consultation today! Call us at 909-627-1111 or make an appointment online!
Orthokeratology is nicknamed “ortho-k” and sometimes called corneal reshaping (CR), corneal refractive therapy or vision shaping.
Some new ortho-k lens designs are also available for farsightedness and presbyopia. Research has also demonstrated that orthokeratology lens designs slow the progression of myopia or myopia control.
Good candidates for orthokeratology include youngsters age 8 to 12 with progressive myopia, as well as most adolescents and adults, although the best success is with people under age 40. Ortho-k is recommended for low to mild nearsightedness (-4 diopters or less).
Ortho-K therapy involves changing the curvature of the cornea by temporarily molding its shape using a gas permeable contact lens. The central portion of the lens fits closer to the eye than a standard contact lens – exerting a gentle pressure. The outer part of the lens surrounds the central visual zone and is farther away from the cornea allowing room for the cornea to change shape. By changing the curvature of your cornea, Ortho-K therapy refocuses light onto your retina, resulting in clearer vision.
Keratoconus is a vision disorder that occurs when the normally round cornea (the front part of the eye) becomes thin and irregular (cone) shaped. This abnormal shape prevents the light entering the eye from being focused correctly on the retina and causes distortion of vision.
In its earliest stages, keratoconus causes slight blurring and distortion of vision and increased sensitivity to glare and light. These symptoms usually appear in the late teens or late 20s. Keratoconus may progress for 10-20 years and then slow in its progression. Each eye may be affected differently. As keratoconus progresses, the cornea bulges more and vision may become more distorted. In a small number of cases, the cornea will swell and cause a sudden and significant decrease in vision. The swelling occurs when the strain of the cornea’s protruding cone-like shape causes a tiny crack to develop. The swelling may last for weeks or months as the crack heals and is gradually replaced by scar tissue. If this sudden swelling does occur, your doctor can prescribe eyedrops for temporary relief, but there are no medicines that can prevent the disorder from progressing.
Eyeglasses or soft contact lenses may be used to correct the mild nearsightedness and astigmatism that is caused by the early stages for keratoconus. As the disorder progresses and cornea continues to thin and change shape, rigid gas permeable or hard contact lenses can be prescribed to correct vision adequately. In most cases, this is adequate. The contact lenses must be carefully fitted, and frequent checkups and lens changes may be needed to achieveand maintain good vision.
Rigid Gas Permeable (RGP)
Many advances have been made to hard contact lenses since the 1970s to create a healthier lens for eyes. The improvements resulted in “rigid gas permeable” lenses which are slightly more flexible and allow oxygen to pass through the lenses to the cornea. They are still regarded as hard contact lenses because they maintain their shape on the eye. Rigid gas permeable contacts, also called GP or RGP lenses, have many advantages beyond healthy oxygen flow. RGPs lenses have helped slow down the development of nearsightedness in young and adult lens wearers. Generally, the advantages of GP hard contact lenses outnumber the disadvantages.
Advantages of GP “Hard” Contact Lens:
- Extremely durable
- Easy to care for
- Easy to handle and wear
- Do not dehydrate
- Retain their shape
- Offer clear, crisp vision
- Correct most astigmatism
- Available as bifocal and multifocal
- Available in various colors and costume designRGP lenses are preferred by people who want to reduce their risk of eye infections and for those who are dissatisfied with the alternative type of contact lens – soft contact lenses.