ABO exam 2023 with 100% correct answers

To what does a ptosis crutch give support? - correct answer --Upper Lid. How is a lens' focal LENGTH altered? - correct answer --Changing the curvature of one surface. Which instrument measures vertex distance? - correct answer --Distometer. What controls the amount of light that enters the eye? - correct answer --Iris. Which word is used to describe light's changing direction as it passes from one medium to another? - correct answer --Refraction. Frame materials are available in which two forms? - correct answer --Metal and plastic. Meniscus, equiconcave and flat concave are types of what? - correct answer --Minus lenses. What term is used to describe the eye's TENDENCY to turn from it's normal position? - correct answer --Phoria What is the refractive condition in which light focuses directly on the retina? - correct answer --Emmetropia. What kind of lens has one convex and one concave surface? - correct answer --Meniscus.