(1b) Auto-refractor

Question 1

explain auto refractor

Answer 1

• objective refraction: no need for px response
• target built in, feels close, hence accommodation simulated
• gives more minus (myopia overestimated, hyperopia underestimated)
• many results can be produced

Question 2

auto refractor advantages

Answer 2

• fast testing (few seconds) hence reduces consultation time
• accurate axis for astig

Question 3

auto refractor (lackof) suitability

Answer 3

young children, young hyperopes (strong accommodation)

Question 5

open field refractor

Answer 5

• distant target
• more accommodative control
• more plus/hyperopic results