What does HVID mean?

HVID stands for Horizontal Visible Iris Diameter. This measurement is crucial in contact lens fitting as it provides an understanding of the size of the area of the iris that is visible when viewing the eye from the front. Knowing the HVID helps practitioners select the appropriate lens diameter for optimal comfort and corneal coverage.

A proper fit not only enhances aesthetics by ensuring the lens aligns well with the natural contours of the eye but also ensures that the lens remains centered on the cornea during eye movement. This is key for optimal vision and comfort, minimizing complications or dissatisfaction with lens wear.

In contrast, the other options do not reflect standard terminology used in ophthalmology or contact lens fitting, leading to confusion or incorrect assumptions about the measurements and their significance in the contact lens fitting process.