chapter 15 spectacle skills

Question 1

Care must be taken to figure the transposition correctly, because an error:
a) may result in induced prism
b) may result in an incorrect prescription
c) may make it impossible to fit the lenses into the frame
d) may make the lenses thicker than they should be

Answer 1

B- may result in an incorrect prescription

Question 2

Transpose −1.25 − 6.25 × 173:
a) −7.50 + 6.25 × 083
b) −4.00 + 6.25 × 083
c) −1.25 − 7.50 × 063
d) −7.50 + 6.25 × 063

Answer 2

A- -7.50 +6.25 x 083