Normal central corneal thicknesses are in the range of 475 to 596 micron. It is found that there is normal diurnal variation in CT: a slight thinning of the cornea throughout the day (morning to afternoon). Thinning of about 7.9 in the central corneal region and 9.3 in the peripheral corneal annular region. But with contact lens corneal thickness increases. The hydrogel toric contact lens causes the greatest level of corneal thickening in the central (20.3 micron) and peripheral cornea (24.1) with an obvious regional swelling of the cornea beneath the stabilizing zones. The anterior corneal surface generally shows slight flattening. All contact lenses results in central posterior corneal steepening.
Posted on: Sun, 11 Aug 2013 16:39:10 +0000
Trending Topics
Recently Viewed Topics
© 2015