subject: Keratoconus And Hard Or Rgp Contact Lenses [print this page] Hard or Rigid Gas Permeable lenses are among the most common forms of vision correction for individuals with Keratoconus. This write-up examines exactly what makes these lenses so successful and what problems they might create.
Keratoconus is a condition of the front lucid component of the eye which is the cornea. In a typical eye the cornea is smoothly rounded. In individuals with Keratoconus the cornea thins as well as distorts in an outward direction into an irregular 'cone' shape.
This distortion of the eye results in lowered vision as the light entering the eye is able to not be appropriately focused onto the retina and also this results in obscuring as well as 'ghosting'.
Spectacles could be useful for very early or moderate circumstances but are of limited usage for more advanced Keratoconus as they do not fix the distortion of the eye. Likewise Hydrogel lenses (soft contact lenses) are of limited once the disease proceeds past the moderate stage.
The moment the distortion becomes even more pronounced and also irregular glasses may not be aligned effectively to handle the a number of focus points resulted in by the irregular design. Hydrogel (soft) lenses are slim and curve to the exact same shape as the cornea. Because the formn of the cornea is the complication this suggests they don't repair the major issue (although there are some thicker soft lenses that are best at keeping their personal design and therefore go someway to the benefits of RGP lenses).
RGP or Rigid Gas Permeable contact lenses are small lenses, normally somewhat smaller in diameter than the colored component of your eye.
As the name proposes they are rigid, they are even often described as hard lenses.
Due to the fact that they are rigid they maintain their own form when suited to the eye. This likewise indicates that they trap a layer of fluid (tears) between the area of the corneas as well as the contact lens.
The combination of your cornea, the fluid and also the RGP lens forms a solitary refractive area that is a little bit like a synthetic cornea. This synthetic cornea has a normal design as well as has the ability to refract light so that it could be centered correctly on the retina. Blurring as well as 'ghosting' are eliminated, or at least lessened, and also vision is enhanced.
There are some disadvantages to these types of contact lenses.
Their rigid quality makes them less relaxed than soft lenses. This can be as an outcome of tension on the cornea or as an outcome of the edge of the lens rubbing on the inner area of the eyelid.
They are even even more susceptible to pain in dry or dusty conditions.
Where the curve of the cornea is remarkably steep the lens balances on the eye with a substantial space around the edge. Think about balancing a shallow dish on the end of a rugby ball. This could make the edge even more prominent, which of course lowers the convenience degree and also make it a great deal easier for the lens to be dislocated and also dropped.
Regardless of these negative aspects the majority of people with Keratoconus will definitely get excellent correction with RGP lenses and they are most definitely worth being determined with.
If you are new to them they could spend some time to get used to, as well as it might be essential to 'develop' the time you wear them over an amount of weeks.
Of course RGPs aren't the only option and also additional contact lens solutions can be utilized if RGPs don't help you. These consist of Scleral lenses, Hybrid lenses as well as Piggyback options.
