Ophthalmometer is an important ophthalmic instrument widely used in the field of contact lens fit...

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Measurement Standard for Ophthalmometers

 

Ophthalmometer is an important ophthalmic instrument widely used in the field of contact lens fitting and refractive surgery for the measurement of human corneal radius of curvature and corneal refractive power of front surface. Measurement results are accurate or not directly related to the health of the patient's vision. The developed measurement standard for ophthalmometers used two shapes of convex spherical and concave spherical with three radius specifications respectively. With the wide coverage, easy to operate, reliable measurement values, this combination of characteristics is not only solve the metrological verification of measuring human cornea curvature dedicated ophthalmometer, can solve the verification of ophthalmometer used to measure radius of curvature for contact lens products. On the basis of this scientific research, JJG 1011 “Verification regulation of ophthalmometers” was drafted in 2006 and in 2007 working primary standard for ophthalmometers was established which assume the value transfer and traceability for ophthalmometers nationwide.

 

measurement principle of ophthalmometer