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The white sclera is the opaque, protective outer layer of the eyeball. In the context of eyewear, the sclera is the critical landing zone for specialty scleral contact lenses. These large diameter lenses do not touch the sensitive cornea; instead, they rest entirely on the white sclera, providing a vault of fluid for the patient.
read more about white sclera ...Because the sclera is less sensitive than the cornea:
If the white sclera becomes red, it can swell. This change in anatomy can cause a previously well fitted contact lens to become too tight, leading to discomfort and further irritation. Contact lens wearers should never insert lenses if the sclera is noticeably red.
In rare cases, certain medications or systemic issues can cause the sclera to take on a bluish or yellowish tint. Eye doctors monitor the color of the sclera to ensure that eyewear and cleaning solutions are not causing toxic reactions or irritation.
Modern opticians use Scleral Topography to map the curves of the white part of the eye. This allows for the creation of custom eyewear that mirrors the unique shape of an individual's sclera, ensuring a perfect, irritation free fit.
Redness in the sclera is a sign of inflammation or irritation. If you wear contacts, you should take them out immediately and see your eye doctor to check for infection.
Yes. Scleral lenses are designed to rest gently on the white sclera while vaulting completely over the clear cornea. This makes them very comfortable for people with sensitive eyes.
Scleral lenses are transparent, but an eye doctor can see the edge of the lens resting on your sclera during a checkup using a specialized microscope.
1. Anatomy of the Eye. American Academy of Ophthalmology. https://www.aao.org/eye-health/anatomy/sclera. Accessed February 9, 2026.
2. The Sclera and Systemic Disease. EyeWiki. https://eyewiki.org/Sclera. Accessed February 9, 2026.
3. Iridology and the Sclera. American Optometric Association. https://www.aoa.org/healthy-eyes/eye-and-vision-conditions. Accessed February 9, 2026.
4. Clinical Anatomy of the Eye. Snell RS, Lemp MA. Blackwell Science; 2013.
5. Watson PG. The nature and the treatment of sclera inflammation. Transactions of the Ophthalmological Societies of the United Kingdom. https://pubmed.ncbi.nlm.nih.gov/793615/. Accessed February 9, 2026.