This technique requires placing an ultrasound probe on the central cornea.

The ring is virtually invisible around the central cornea which is the critical area for clear vision.

Airedale Terrier - occurs at 4 to 12 months of age in the central cornea.

Alaskan Malamute - occurs at greater than two years of age in the central cornea.

Rough Collie - occurs at one to four years of age in the inferior or central cornea.

Weimaraner - Occurs at one to eight years of age in the central cornea.

Whippet - occurs at three to five years of age in the central cornea.

This machine measures the curvature of your central cornea.

Stage 1 Cells infiltrate the periphery of the flap, without involving central cornea.

Stage 3 Cells at the central cornea form clumps of dense cell aggregates.