By Clifford W. Brooks OD
Realizing Lens Surfacing covers either thought and scientific program of ophthalmic lens surfacing from begin to end. either scholars and educators will locate the textual content effortless to learn and good prepared: lens surfacing ideas are defined, tested via in actual fact conveyed examples, and summarized in step by step tables
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Extra info for Understanding Lens Surfacing
Example text
When the semifinished lens blank is small, grinding the optical center in the middle produces a lens that is not big enough for the frame. If lens size is not checked ahead of time, the problem will not show up until edging. Then it results in a space between the edge of the lens and the frame eyewire. Because the traditional method of off-center block- 42 / UNDERSTANDING LENS SURFACING 120-DEGREE CYLINDER AXIS 60-DEGREE CYLINDER AXIS PRISM BASE O (BASE IN) L R PRISM BASE 180° (BASE IN) Figure 3 - 1 3 Normally, in a pair of lenses with prism the arrows will point in opposite directions.
75 - 1 . 0 0 x 180? Using Fry's tables and American National Standards Institute recommendations, what base curves should be used for the following lens pairs? 19. 50 - 1 . 0 0 x 30 - 2 . 0 0 - 0 . 7 5 x 150 R base curve. L base curve_ 20. 25 - 1 . 25 - 0 . 7 5 x 150 R base curve. L base curve_ 21. - 6 . 0 0 - 1 . 0 0 x 30 - 5 . 0 0 - 0 . 7 5 x 150 R base curve_ L base curve_ 22. 50 - 1 . 50 - 0 . 7 5 x 150 5 BO R base curve_ L base curve_ 23. What would the minimum blank size be for the following lens/frame combination if the lens were to be edged from a finished uncut?
O n c e it has been surfaced, this lens is just like a finished (uncut) lens. During edging the cylinder axis can be turned in any direction n e e d e d . Because the cylinder axis can be turned later, the lens is m a r k e d for blocking exactly as the sphere lens was. T h e location of the axis doesn't m a t t e r . Marking Spherocylinders for Off-Center Blocking W h e n a lens is blocked off center, it is no longer symmetrical. T h e optical center has been decentered in a specific direction for the purpose of getting m o r e usable area out of the available lens diameter.