Refraction training manual
Answers to questions
Neutralisation
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+ 2.50 × 65 and + 1.00 × 155 = + 2.50 / -1.50 x 155
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+ 1.50 × 85 and - 1.00 × 175 = + 1.50 / - 2.50 x 175
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- 3.75 × 45 and - 1.00 × 135 = - 1.00 / - 1.75 x 45
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plano × 90 and + 1.75 × 180 = + 1.75 / - 1.75 x 90
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- 0.25 × 10 and + 1.50 × 100 = + 1.50 / - 1.75 x 10
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+ 6.00 × 90 and - 1.00 × 180 = + 6.00 / - 7.00 x 180
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+ 10.00 × 80 and + 12.00 × 170 = + 12.00 / - 2.00 x 80
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- 1.75 × 180 and plano × 90 = plano / - 1.75 x 180
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+ 3.00 × 125 and - 3.00 × 35 = + 3.00 / - 6.00 x 35
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- 4.75 × 25 and plano × 115 = plano / - 4.75 x 25
Transposition
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+ 2.50 / - 1.50 × 40 = + 1.00 / + 1.50 x 130
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+ 6.00 / + 2.50 × 130 = + 8.50 / 2.50 x 40
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- 1.00 / + 2.00 × 55 = + 1.00 / - 2.00 x 145
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- 3.00 / - 2.25 × 175 = - 5.25 / + 2.25 x 85
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+ 5.00 / - 4.25 × 95 = + 0.75 / + 4.25 x 5
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+ 2.25 / - 2.25 × 160 = plano / + 2.25 x 70
Spherical equivalent
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+ 2.50 / - 1.50 × 40 = + 1.75
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+ 6.00 / + 2.50 × 130 = + 7.25
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- 1.00 / + 2.00 × 55 = plano
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- 3.00 / - 2.25 × 175 = - 4.00 or - 4.25
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+ 5.00 / - 4.25 × 95 = + 3.00 or + 2.75
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+ 2.25 / - 2.25 × 160 = + 1.25 or + 1.00
The Crossed cylinder lens
Spherical equivalent of a crossed cylinder lens = plano!
