Corneo-scleral Contact Lens Definition

Contact lenses are commonly used instead of spectacles.

Corneo-scleral lenses are a type of contact lens used to correct defects in vision. The name refers to the area and resting points of the lens in the eye.

Cornea Definition

The pupil is covered by the cornea.

The cornea of the eye is that transparent area of the eye which lets in and focuses light. This encompasses the area over the pupil and the iris.

Sclera Definition

The white part of the eye is called the sclera.

The sclera is the tough white outer coat of the eye, which joins with the cornea in the front of the eye.

Corneo-scleral Contact Lenses

Contact lenses have been used for decades to correct vision

Lenses that rest both on the cornea and on part of the sclera are called corneo-scleral lenses. They range from 12.5 to 15 mm in diameter. The tear reservoir underneath the lens is limited compared to full scleral lenses. In the United States, corneo-scleral lenses are the most common used. Lenses that have at least part of their area resting on the sclera are believed to be among the best lenses for correcting irregular corneas.

References

• Medicine Net: Definition of Cornea
• Free Dictionary: Definition of Sclera
• Contact Lens Spectrum: Exploring Beyond the Corneal Borders