transitional zone

  1. The region of the lens of the eye where cells from the anterior epithelial capsule become transformed into the fibers that compose the lens substance.
  2. The portion of a scleral contact lens that joins the corneal and scleral sections.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.