Unit 3: Eyeglass Equipment And Measurement

Question 1

Range of pupillary distance in adults

Answer 1

54mm to 70mm+

Question 2

Distance away from patient during manual PD measurement

Answer 2

40 cm With eyes at same vertical level

Question 3

Challenges of Manual PD measurement

Answer 3

-Large difference in examiner and patient PD
-To close or too far from patient
-Examiner not closing their eye
-Not measuring at spectacle plane