Scleral GP Contact Lenses: If you’ve got been told inside the past that you cannot wear contact lenses because of an irregular cornea or other issues, you may also want to get a second opinion and ask your eye medical doctor approximately scleral contact lenses.
Scleral contacts are massive-diameter gas permeable contact lenses mainly designed to vault over the whole corneal floor and relaxation at the “white” of the attention (sclera). In doing so, scleral lenses functionally update the abnormal cornea with a perfectly smooth optical floor to correct vision issues due to keratoconus and other corneal irregularities.
Also, the gap between the cornea and the back floor of a scleral lens acts as a fluid reservoir to provide consolation for people with dehydrated eyes who otherwise couldn’t tolerate touch lens wear.
Types of Scleral GP Contact Lenses
Scleral contacts are exceedingly more extensive than fashionable fuel permeable (GP) contacts and have a diameter identical to or extra than that of smooth touch lenses. The smallest sclerals are approximately 14.five mm in diameter, and the most important may be as much as 24 mm.
Large-diameter scleral and semi-scleral GP lenses relaxation at the sclera and vault over the misshapen cornea of a person with keratoconus, for higher vision. Typically, lenses that are 18 mm or smaller are subcategorized as mini-scleral.
The typical human cornea is approximately 11.8 millimetres in diameter, so even the smallest scleral contacts are designed to cover the complete corneal surface. In comparison, most traditional GP touch lenses are 9.0 to 9.5 mm in diameter and cowl handiest 75 to 80 per cent of the cornea.
Another category of gasoline permeable lenses bridges the size gap among traditional GP lenses and mini-scleral. These lenses, referred to as corneoscleral lenses, commonly are approximately 13 to fifteen mm in diameter.
Corneo-scleral lenses often are a good desire for those who require large-than-regular GP lenses for higher consolation. They also are often used while contact lenses are wanted after LASIK or other corneal refractive surgical operations to accurate abnormal astigmatism.
The size of the lens used regularly is determined with the aid of the degree of complexity of the condition. Milder types of keratoconus and abnormal astigmatism from corneal grafts and refractive surgery regularly are without problems managed with scleral lenses on the smaller cease of the spectrum.
Smaller scleral and mini-scleral contacts may be simpler to apply, can be less high priced and require fewer care products. More complicated conditions, which include superior keratoconus, pathologically dry eyes or extreme ocular floor disease that would require a large tear reservoir, frequently are outfitted with large scleral lenses, as they have extra capacity to maintain fluid or bridge huge adjustments in corneal curvature.
During your touch lens examination and fitting, your eye care professional will decide the excellent scleral lens kind and size for your unique needs.
Scleral Contact Lenses for Keratoconus
Many optometrists and ophthalmologists advise scleral touch lenses for a variety of hard-to-suit eyes, inclusive of eyes with keratoconus. In cases of early keratoconus, a fashionable GP lens may be used. However, if the lens does now not centre nicely on the attention or actions excessively with blinks and reasons discomfort, switching to a massive-diameter scleral touch lens may additionally solve the hassle.
Because scleral lenses are designed to vault the corneal surface and relaxation at the less touchy surface of the sclera, these lenses frequently are extra snug for a person with keratoconus.
Also, scleral lenses are designed to match with minimal lens movement for the duration of blinks, making them greater solid on the attention, compared with conventional corneal gasoline permeable lenses.
Scleral GP Contact Lenses for Other Eye Problems
In addition to keratoconus, scleral touch lenses may be used for eyes that have undergone a cornea transplant and for people with severe dry eyes caused by situations including Sjogren’s syndrome, graft-versus-host disease (GVHD) and Stevens-Johnson syndrome.
Advances in lens design era are allowing manufacturers to design scleral lenses that can handle accurate extra situations than ever before, such as bifocal scleral for the correction of presbyopia.
Special-Effect Scleral Contacts
Sometimes the term “scleral lenses” (or “sclera lenses”) is also used to describe special-impact contact lenses that dramatically alter the arrival of the wearer’s eyes.
However, these costume touch lenses (additionally referred to as theatrical touch lenses, Halloween contacts or gothic lenses) commonly are smooth lenses that undergo little resemblance to scleral gas permeable contacts — other than their large diameter to mask the cornea completely. Also, smooth, theatrical contacts usually are designed for beauty purposes most effective and not for imaginative and prescient correction.
Scleral GP Contact Lenses Cost
Scleral contact lenses are personalized for each wearer, so becoming scleral contacts demands more expertise and more significant time than fitting, widespread gentle or GP contact lenses.
Often, automatic maps of the curvature of the entire cornea are generated to facilitate the lens becoming, and numerous trial lenses of various sizes and curvatures may be applied to the eye during the fitting process.
Also, relying on the complexity of the trouble and the way the person’s eye tolerates the scleral lens, adjustments of lens parameters can be needed, which allows you to require additional lenses to be made and exchanged. The entire scleral lens becoming system can take numerous visits to determine the choicest lens for every eye.
While many those who use scleral lenses have worn soft or corneal GP lenses in the beyond, the procedure for applying and eliminating scleral lenses may also take a few practices. The additional time needed to grasp this, due to the more significant length of the lenses and the fluid reservoir beneath the lenses, wishes to be taken into consideration in the course of the fitting manner.
For those and different reasons, scleral touch lenses can value notably higher than fashionable contacts; in fact, it isn’t unusual for scleral contacts to price three or four times more. While no longer typical, in instances while a complex, a tremendously customized scleral lens is required.
Most insurance applications do now not automatically cover the full price of scleral contact lenses. In some instances, vision coverage may additionally reduce the fee of your lenses and fitting cost. In other instances, contacting your medical health insurance provider and inquiring what steps are vital to gain coverage may be helpful. Ask your eye health practitioner’s workplace for details.