By Clifford W. Brooks OD
Either opticians and optometrists are expert to grind and varnish lenses after which to take the surfaced lens and end it through centering it optically and grinding the sides in order that the lens matches within the form of the selected body. completely revised and up-to-date with seven new chapters to hide adjustments within the undefined, this 2d version presents a step by step knowing of lens completing for the optometrist or optician.
- Content has been thoroughly up-to-date, reorganized and extended to incorporate the newest changes.
- Updated photographs illustrate the most up-tp-date forms of lenses and increase comprehension of lens finishing.
- Seven new chapters hide rimless and semi rimless frames; environmental and security issues; lens insertion and conventional alignment; nylon wire and different groove mountings; lens tinting and engraving; innovative addition lenses; and lens influence and resistance testing.
- An appendix of particular British criteria permits the booklet to simply go back and forth to the united kingdom and different nations that style their dishing out courses after the united kingdom model.
- The Lens Centration abilities sequence presents routines to perform lens completing and strengthen fabric from the text.
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Extra info for Essentials of Ophthalmic Lens Finishing
Two small, etched marks usually are found at about 17 mm from either side of the lens center. or • The practitioner holds the lens up to a light and looks through the lens. 35 CHAPTER 2 SPOTTING OF LENSES or • A commercially available lens mark ﬁnder that illuminates and magniﬁes is used. 2. 9 3. The lens is placed on a veriﬁcation card and turned so that the dots fall at the indicated “engraved circle” points of the card. The lens manufacturer provides veriﬁcation cards. 4. The appropriate lines are drawn on the lens from the master markings found on the veriﬁcation card (Figure 2-39).
The crucial factor is the location of the imperfect or damaged portion in relation to the ﬁnal lens shape and lens power. A A BLEMISHED SPHERE The most versatile lens type is the spherical lens. 5 Therefore if a large chip were to be broken from its edge as shown in Figure 2-29, A, the lens must be turned only so that during the edging process this chipped portion will be edged away (Figure 2-29, B). A BLEMISHED SPHEROCYLINDER A spherocylinder lens is less adaptable. It has only two possible orientations.
3. The segment is rotated inward so that it is somewhat nasally located. 4. The lens is moved until the major reference point is located. 5. The lens is spotted. 6. Because these lenses are spheres, the two outside lensmeter dots are wiped off to avoid confusion later. A Distance optical center Spherocylindrically Powered Round-Segment Lenses 1. The sphere power and cylinder axis are set in the lensmeter. 2. The lens is placed in the lensmeter. 3. The lens is moved until the major reference point is located.