The scleral lens, also known as scleral contact lens and ocular surface prosthesis is a large contact lens located on the sclera and creates a tear. - equipped dome on the cornea. Scleral lenses are designed to treat various eye conditions, many of which do not respond to other forms of treatment.
Video Scleral lens
Usage
Medical use
Scleral lenses can be used to improve vision and reduce pain and light sensitivity for people suffering from more eye disorders or injuries, such as severe dry eye syndrome, microphthalmia, keratoconus, corneal ectasia, Stevens-Johnson syndrome, SjÃÆ'¶ gren syndrome, aniridia, neurotropic keratitis (aneasthetic cornea), post-LASIK complications, higher sequence deformities, post corneal transplantation complications and pellucid degeneration. Eye injuries such as surgical complications, distorted corneal implants, and chemical wounds and burns can also be treated by using scleral lenses.
Skleral can also be used in people with eyes that are too sensitive to smaller types of corneal lenses, but require a more rigid lens for vision correction conditions such as astigmatism.
Special effects
The scleral lens does not become confused with the "sclera" lens, which is soft lens and contains no liquid reservoir. The "Sclera" lens is used in movies like spy monsters removed in Evil Dead, or black eyes in Underworld and Underworld: Evolution, or episode Star Trek Where Nobody Has Been Missed Before . These lenses tend to be uncomfortable and sometimes block the vision of the actors, but the resulting visual effects can be striking. These lenses can be specially painted, though most companies only sell lenses with a pre-designed look.
Measurement of eye movements
In experiments in ophthalmology or cognitive science, scleral lenses with embedded mirrors or with magnetic field sensors embedded in the form of wire coils (called scleral coils) are commonly used to measure eye movement.
Maps Scleral lens
Design
The modern scleral lens is made of a highly absorbent polymer of oxygen. They are unique in their designs in that they match and are supported by sclera, the whites of the eyes. This unique positioning cause is usually relevant to a particular patient, whose corneas may be too sensitive to support the lens directly. Compared with corneal contact lenses, the sclera lenses stand out much more. The space between the cornea and the lens is filled with artificial tears. The fluid, contained in a thin elastic reservoir, corresponds to deviations from the defective cornea, allowing the vision to be restored comfortably. This helps provide BCVA, or Best Corrected Visual Acuity.
Scleral lenses differ from corneal contact lenses because they create a space between the cornea and the lens, which is filled with fluid. The prosthetic application of the lens is to cover or "wrap" the ocular surface, providing a therapeutic environment to deal with severe eye surface diseases. The outer axis of the sclera lens and the fluid-filled space between the cornea and the lens also corresponds to the irregular cornea and can neutralize the corneal surface abnormalities.
Usage
Insertion
Scleral lenses can be inserted into the eye directly from the fingers, from the plunger held by hand, or from the stationary-lit plunger on the stand. Before inserting the scleral, the lens is fully loaded with sterile saline solution or other solution mixture. Some fluids are allowed to drip from the lens when inserted to ensure no bubbles are trapped beneath the lens after being attached to the eye. The lens can then be rotated in the right direction, often denoted by a mark on the "top" of the lens, with the finger. The "left" scleral lens is often marked with two dots, and the "right" is indicated by a single point.
Removal and Storage
Scleral lens is removed using a finger, or a small lens eraser plunger. The lenses are then cleaned and sterilized before reinsertion. Scleral lenses can not be worn during sleep, so many users clean their lenses overnight. Unlike regular contact lenses, many sclerals can be kept dry when not in use for longer periods of time.
History
The scleral lens is a prototypical lens originating from the early 1880s. Initially this lens is designed using a substance to pick up eye prints. The lenses will then be molded to fit the mold, initially using blown glass and then milled glass in 1920 and polymethyl methacrylate in the 1940s. Early sclerals are not oxygen permeable, which severely limits the amount of oxygen given to the wearer's cornea. Thus, the initial lens became unused until the 1970s.
Production of scleral lenses increases again after the oxygen permeable material, initially used in rigid permeable gas (RGP) lenses, becomes available for other uses. The mold development approach replaced the use of experimental kits, where patients tested a series of stock lenses for several days, weeks, or months to find the most appropriate. The recent development of digital imaging techniques has enabled some providers to evaluate and improve compatibility with greater accuracy. A number of scleral manufactures have also made scleral lenses with adjustable adjustment points available, so that each lens can be adjusted through a lathe to better fit a single eye contour.
The latest developments show new innovations from EyePrintPRO pro-design scleral lenses where the prints are taken from the cornea and sent to the lab where 3D software designs the lens to fit within each patient's specific corneal area, other advances include experimental wavefront optics that are inserted into the sclera lens some other manufacturers like iZon are working on correcting higher abortions, current scleral lenses without additional optics corrects 70 percent or more of the varying high-order cancellations among patients, these and other technologies hope to correct all abortions
References
External links
- The Scleral Lens Education Society
Source of the article : Wikipedia
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