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Definition and Indications
Scleral Lenses
Scleral lenses are rigid gas permeable contact lenses with a large diameter ranging from 14 mm to 20 mm. They are called "scleral" lenses because they vault over the cornea (the transparent tissue that covers the colored part of the eye) and rest on the sclera (the white part of the eye).
Rigid lenses are divided into 3 groups and their definition is based on the area where they bear on the ocular surface: corneal lenses rest exclusively on the cornea, corneo-scleral lenses rest on the cornea and sclera and scleral lenses rest exclusively on the sclera.
The peculiarity of these lenses is the combination of the large diameter and the rigid material.
The large diameter offers great comfort, which is the result of:
1- Less interaction between the lens edge and the eyelids;
2- The lens does not touch the cornea, and rests on the conjunctiva, which is less sensitive;
3- The lens is very stable on the eye, it does not move when the patient blinks: as a result, the vision is stable, not fluctuating as can happen in the case of corneal lenses or toric soft lenses fitted on irregular corneas.
The rigid material does not conform to the cornea and allows for the creation of a large liquid reservoir,
1- Which acts as a lens correcting 89% of regular and irregular corneal astigmatism.
2- Which protects, lubricates and moistens the ocular surface during all the wearing time. This is crucial especially in cases of dry eye and other ocular surface diseases.
Scleral Lens Indications
Patients with irregular corneas such as keratoconus, pellucid marginal degeneration, post-keratoplasty or post refractive surgery can benefit from scleral lenses. Dry eye syndrome, graft vs. host disease, Sjögren's syndrome, Stevens-Johnson syndrome, neurotrophic keratopathy, and some inflammatory conditions, such as limbal stem cell deficiency and corneal pemphigoid, could have advantages from wearing scleral lenses as well. Patients who need vision correction (myopia, hyperopia, astigmatism and presbyopia) but have failed with other contact lens modalities can have benefits wearing scleral lenses.
Hygiene and Care Solutions
Proper hygiene and the correct use of solutions are essential to prevent complications and ocular infections.
How many Hours Can I Wear My Lenses?
The scleral lens wearing time depends on the ocular conditions. In absence of problems, it is possible to wear the lenses for up to 12-14 hours. But again, this varies between individuals and it is important to refer to your specialist who knows the case best.
Should I Change the Post-Lens Liquid during the day?
Contact me
Contact me
It seems that in some countries, practitioners recommend their patients to remove their scleral lenses 2-3 times per day to renew the saline in the bowl.
Via G. De Vito, 5 | Poggio Mirteto ⎪ Rieti
Via G. De Vito, 5 | Poggio Mirteto ⎪ Rieti
info@daddifadel.com
info@daddifadel.com
Why Do I Experience Fogging When Wearing My Lenses?
Fogging may occur when wearing scleral lenses and may be due to poor wettability and midday fogging. Wettability refers to how liquid spreads over a surface and depends on lens materials.
Instructions on How to Apply and Remove Scleral Contact Lenses
Handling and following the indications provided during the education sessions are fundamental to prevent infections and complications when wearing scleral lenses. This video is helpful to remember handling techniques of scleral lenses.
Instructions on How to Capture Images of Your Eyes
Sometimes, you may need to take a photo of your eyes and send it to your doctor for a remote evaluation. This is a tutorial on how to yake good pictures.