Instructions:

Tell the patient what you are about to do so they don’t get a fright when the eyelid is touched.

Place the frame on the patient after the fitting of it has been completed while the demo lenses are still in place. Ask the patient to close the eye and to look straight ahead so the cornea bulge is in line with the lens centre. Close the scissor action so it reads zero on the scale and place the arms behind the lens and slowly open them until the tips are lightly touching the back of the lens and the cornea. Remove and read off the measurement.

Measurements:

Gauge Height: 110 mm

Calculator: 150 mm Dia.