Featuring a compact design, the Topcon OM-4 ophthalmometer is an easy to use instrument and delivers accurate measurements of the corneal radius of curvature along with radius of the contact lens curvature. Measuring time is greatly reduced thanks to the ability to measure principal meridians simultaneously. Other features of the The Topcon OM-4 ophthalmometer include one position speedy speedy measurement and and overall weight of just 16 kgs.