Questions and Answers
Transpose the following prescription: +1.00 +2.00 x 90
+3.00 -2.00 x 180
Transpose the following prescription: +100 +200 × 90
+3.00 -2.00 x 180
Transpose the following prescription: -0.75 +3.00 x 180
+2.25 -3.00 x 090
Transpose the following prescription: +2.25 +1.75 x 085
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Transpose the following lens prescriptions: +4.25 +1.50 x 135
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Transpose the following lens prescription: -4.00 +3.00 x 45
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Transpose the following lens prescription: -3.00 +0.75 x 180
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What is spherical equivalent of -1.00 +2.00 x 180?
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What is spherical equivalent of +2.00 +2.50 x 90?
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What is spherical equivalent of -0.75 + 1.50 x 180?
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What is spherical equivalent of -2.50 +2.50 x 155?
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What is spherical equivalent of +2.25 +0.50 x 150?
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The spherical equivalent of +1.00 +2.50 x 90 is?
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Transpose the following prescription: -3.00 +2.00 x 30
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Transpose the following prescription: -3.00 -2.00 x 30
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Transpose the following prescription: +3.00 -2.00 x 30
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Transpose the following prescription: +3.00 +2.00 x 30
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Convert DVA of 20/20 feet into meters.
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Convert DVA of 20/30 feet into meters.
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Convert DVA of 20/40 feet into meters.
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Convert DVA of 20/50 feet into meters.
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Convert DVA of 20/60 feet into meters.
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Convert DVA of 20/70 feet into meters.
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Convert DVA of 20/80 feet into meters.
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Convert DVA of 20/100 feet into meters.
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Study Notes
Lens Transposition
- Transposing a prescription involves converting it from its original form to another, maintaining equivalent optical power.
- The process adjusts the sphere and cylinder values while changing the axis measurement.
Example Transpositions
- From +100 +200 × 90 to: +3.00 -2.00 × 180.
- From -0.75 +3.00 × 180 to: +2.25 -3.00 × 090.
- From +2.25 +1.75 × 085 to: +4.00 -1.75 × 175.
- +4.25 +1.50 × 135 becomes: +5.75 -1.50 × 45.
- From -4.00 +3.00 × 45 to: -1.00 -3.00 × 135.
- From -3.00 +0.75 × 180 to: -2.25 -0.75 × 90.
Spherical Equivalent Calculations
- The spherical equivalent simplifies a lens prescription into a single power.
- Example conversions yield:
- For -1.00 +2.00 × 180: Plano.
- For +2.00 +2.50 × 90: +3.25.
- For -0.75 +1.50 × 180: Plano.
- For -2.50 +2.50 × 155: -1.25.
- For +2.25 +0.50 × 150: +2.50.
- For +1.00 +2.50 × 90: +2.25.
Additional Transpositions
- Prescription of -3.00 +2.00 × 30 transposes to: -1.00 -2.00 × 120.
- -3.00 -2.00 × 30 transposes to: -5.00 +2.00 × 120.
- +3.00 -2.00 × 30 turns to: +1.00 +2.00 × 120.
- +3.00 +2.00 × 30 results in: +5.00 -2.00 × 120.
Vision Acuity Conversions
- Converting Distant Visual Acuity (DVA) measurements from feet to meters involves fractional notation.
- DVA of 20/20 feet equates to: 6/6.
- DVA of 20/30 feet equates to: 6/9.
- DVA of 20/40 feet equates to: 6/12.
- DVA of 20/50 feet equates to: 6/15.
- DVA of 20/60 feet equates to: 6/18.
- DVA of 20/70 feet equates to: 6/21.
- DVA of 20/80 feet equates to: 6/24.
- DVA of 20/100 feet equates to: 6/30.
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Description
This quiz covers the concepts of lens transposition and spherical equivalent calculations. It includes examples of converting prescriptions while maintaining equivalent optical power. Test your understanding of these essential optical math skills.
