9 measurement functions in one tool 53 7.5 ALL RIGHTS RESERVED © MULTIFUNCTION RULER 9 Base of the mount: Double measurement scale to check the base of different mounts size and caliber. 7 Height of the bifocal lens progression channel: Height of the progression channel that joins the distance optical zone with the reading area zone. 8 Corneal apex distance - lens: distance from internal surface of the ophthalmic lens at the corneal apex, usually between 12 and 14 mm. MEASUREMENT EXAMPLES
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