Transposition Quiz

Transpose the prescription '-3.25DS/+3.50DC x117' into minus-cylinder writing.

+0.25DS / -3.50DC x 27

• -3.50 → +3.50DC

• -3.25 + 3.50 = +0.25DS

• 117-90 = 27

What is the sphero-cylindrical combination in minus-cylinder writing for these two positions of clear lines in the manual focimeter? 

+1.25DS / -0.50DC x 95

• most positive - +1.25DS

• DC - 0.75 - 1.25

• most negative - 95

Transpose the prescription '-2.25DS/-0.50DC x22' into plus-cylinder writing.

-2.75DS / +0.50DC x 112

• -0.50 → +0.50DC

• -2.25 + -0.50 = -2.75DS

• 22 + 90 = 112

Transpose the prescription '+0.75DS/+2.25DC x161' into minus-cylinder writing.

+3.00DS / -2.25DC x 71

• +2.25 → -2.25DC

• +0.75 + 2.25 = +3.00

• 161 - 90 = 71

What is the sphero-cylindrical combination in plus-cylinder writing for these two positions of clear lines in the manual focimeter?

+0.75DS/+0.50DC x 5

• most negative - +0.75

• DC - 1.25 - 0.75 = 0.50

• most positive - 5

What is the sphero-cylindrical combination in plus-cylinder writing for these two positions of clear lines in the manual focimeter?

-2.25DS/+0.75DC x70

• most negative: -2.25DS

• DC: -1.50 - -2.25 = +0.75DC

• most positive - 70

What is the sphero-cylindrical combination in minus-cylinder writing for these two positions of clear lines? 

+0.75DS / -1.50DC x 45

• most positive - +0.75

• DC: -0.75 - +0.75 = -1.50

• most negative - 45

Transpose the prescription '+0.25DS/-0.75DC x41' into plus-cylinder writing.

-0.50DS/+0.75DC x131

• -0.75 → +0.75DC

• +0.25 + -0.75 = -0.50DS

• 131 -90 = 41

Transpose the prescription '+2.75DS/+1.25DC x173' into minus-cylinder writing

+4.00DS/-1.25DC x83

• +1.25 → -1.25DC

• 2.75 + 1.25 = +4.00DS

• 173 - 90 = 83

What is the sphero-cylindrical combination in minus-cylinder writing for these two positions of clear lines in the manual focimeter? 

-1.75DS/-1.25DC x 25

• most positive - 1.75DS

• DC: -3.00 - -1.75 = -1.25

• most negative - 25

What is the sphero-cylindrical combination in plus-cylinder writing for these two positions of clear lines in the manual focimeter? 

- -0.75DS / +1.50DC x 235

• most negative - 0.75DS

• DC: 0.75 - -0.75 = +1.50DC

• Most positive - 135

Transpose the prescription '+0.75DS/-1.50DC x75' into plus-cylinder writing

-0.75DS/ +1.50DC x165

• -1.50 → +1.50DC

• 0.75 + -1.50 = +0.75DS

• 75 + 90 = 165

Transpose the prescription '-0.25DS/-1.50DC x34' into plus-cylinder writing.

-1.75DS/ +1.50DC x 124

• -1.50 → +1.50DC

• -0.25 - 1.50 = -1.75DS

• 34 + 90 = 124

What is the sphero-cylindrical combination in minus-cylinder writing for these two positions of clear lines in the manual focimeter?

-1.50DS/ -0.75DC x160

• most positive: -1.50DS

• DC - -2.25 - (-1.50) = -0.75DC

• most negative - 160

What is the sphero-cylindrical combination in plus-cylinder writing for these two positions of clear lines in the manual focimeter? 

-1.75DS/ +1.25DC x 115

• most negative: -1.75DS

• DC: -1.75 - -3.00 = +1.25DC

• most positive: 115

Transpose the prescription '-1.50DS/+0.25DC x15' into minus-cylinder writing.

-1.25DS/ -0.25DC x 105

• +0.25 → -0.25DC

• -1.50 + 0.25 = -1.25DS

• 15 + 90 = 105