What is the average ocular sagittal height?

What is the average ocular sagittal height?

• A. 2,900 um
• B. 3,170 um
• C. 3,400 um
• D. 3,600 um

Answer: (B)

Average ocular sagittal height is the depth of the eye’s anterior segment along the sagittal plane—the space from the corneal summit back toward the sclera that a contact lens must clear. In adults, measurements cluster around about 3.17 mm, or 3,170 μm. This value sits between the smaller end (around 2.9 mm) and the larger end (around 3.4–3.6 mm), making it the typical reference point used when planning lens vault and fitting expectations for scleral and other specialty lenses. Choosing a value near 3.17 mm aligns with the common anatomical depth seen in many eyes, helping ensure adequate clearance over the cornea without excessive vault that could affect lens centration or stability.

Average ocular sagittal height is the depth of the eye’s anterior segment along the sagittal plane—the space from the corneal summit back toward the sclera that a contact lens must clear. In adults, measurements cluster around about 3.17 mm, or 3,170 μm. This value sits between the smaller end (around 2.9 mm) and the larger end (around 3.4–3.6 mm), making it the typical reference point used when planning lens vault and fitting expectations for scleral and other specialty lenses. Choosing a value near 3.17 mm aligns with the common anatomical depth seen in many eyes, helping ensure adequate clearance over the cornea without excessive vault that could affect lens centration or stability.