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Multifocal Designs
Answers to Practice Exercises
Page 15
| 1.) | +
3.50 � 0.50 x 030 + 3.25 � 0.25 x 010 |
4.) | +
4.75 � 0.75 x 025 + 5.00 � 0.50 x 005 |
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| 2.) | +
1.75 � 0.75 x 045 + 1.50 � 0.25 x 180 |
5.) | �
4.00 � 1.75 x 175 � 4.75 � 2.00 x 180 |
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| 3.) | Plano
�1.00 x 090 �0.25 �1.50 x 110 |
6.) | +
8.25 + 2.75 x 090 + 8.50 + 2.50 x 110 |
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Page 17
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Slab off the right lens 4.5
base up for conventional slab off Slab off the left lens 4.5
base down for reverse slab
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Slab off the left lens 4.0
base up for conventional slab off Slab off the right lens 4.0
base down for reverse slab
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Slab off the left lens 3.75
base up for conventional slab off Slab off the right lens 3.75
base down for reverse slab
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Slab off the right lens 6.25
base up for conventional slab off Slab off the left lens 6.25
base down for reverse slab
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