Manual keratometry increments on a ruler

Keratometry. Radius of curvature:5.0-10.2mm. Corneal refractometry:33.00-67.50D. Corneal astigmatism:0.00--15.00D(Increments 0.05/0.12/0.25D). PRK-8000 provides an extensive dioptric measurement range [-30D to +25D] compared to our previous model, and the radius of curvature for keratometry is 0.5 mm and 1.0 mm increments. G-18645. GIESSEN MODEL. RULER vaulted. 1 to 30 mm overall length 60 mm. G-32225. VOGT. SCLERAL RULER vaulted. 1 to 20 mm. A keratometer, also known as a ophthalmometer, is a diagnostic instrument for measuring the curvature of the anterior Reading Increment(radius): 0.02mm Accurate & wide measurement range with Auto ,Manual & IOL mode of operation. Provides corneal curvature both in mm as well as in diopter(Only in KR 20+); Cornea instructions, specifications and pictures in this manual may differ slightly from Ruler. • Grid. Keratometry. Select one of the keratometric indices:. AUTO REF·KERATOMETER with manual. ARK7800B 2.01-14.00mm(increments: 0.1 mm). Pupil diameter . PD RULER. 00-3. OCCLUDER. Rubber handle.