Practice Questions for ABO Q&A 2023

What controls the amt of light entering the eye - Answer- Iris Meniscus, equiconcave and flat concave are types of: - Answer- Minus lenses What is the term used to describe the eye's tendency to turn from its normal position? - Answer- Phoria What kind of lens has one convex and one concave surface? - Answer- Meniscus What material has the most favorable optical properties? - Answer- Crown glass What is the best lens treatment to reduce water and road surface glare? - Answer- Polarized The hard resin material used in plastic lenses is known as: - Answer- CR-39 Aphakia is: - Answer- the absence of a lens The cornea's index of refraction is: - Answer- 1.37 Which term is used to describe the outward inclination of the bottom of a framed lens? - Answer- Retroscopic A monocular PD is given as one number. T or F? - Answer- False You are preparing to block a set of lenses for edging. The frame in the tray measures 55-16 with ED of 60 and B of 56. The work order specifies the Pd as 63/60 with a vertical height of 31. How do you move the lens on your protractor grid if the lens is an OS? - Answer- a)4mm right, 3mm up b)3mm left, 4mm up c)4mm left, 3mm up d)2mm right, 4mm up e)3mm right, 1mm up What would be the near only correction for the following Rx? -10.00 +2.50 X 60 -11.00 +3.00 X 150 Add +2.75 - Answer- The answer is in minus cylinder. The question is in plus cylinder. (-10.00 +2.50) -2.50 X 60 = -7.50 -2.50 X (60 + 90)(-11.00 +3.00) -3.00 X (150 - 90) = -8.00 -3.00 X 60 In order to find the reading Rx, we add the bifocal add power algebraically to the sphere power