Neuttalize The Lens

Question 1

There is a spherical lens present if

Answer 1

the (mires) three thin lines & three thick lines focus at the same power

Question 2

There is a cylinder present if

Answer 2

If both mire lines (thin & thick) will not focus

Question 3

What equipment do you use to neutralize corrective lenses?

Answer 3

Manual Lensometer with green filter

Question 4

Manual Lensometey definition

Answer 4

Reading the Px of corrective lenses. AKA. Nutralizing The Lens
Use green filter