ABO Vocab 2023 Solved 100%

Aberration + types of abberation - ANSWER-deviation from a single focus of light rays from one source; failure to bring light rays to a single focal point two types: chromatic and monochromatic Accomodation - ANSWER-the ability of the eye to adjust focus for varying distances Achromatic - ANSWER-lens that can refract light without creating rainbow effect What effects do Achromatic lens limit and how? - ANSWER-limits effects of chromatic, spherical aberration (combines and thus focuses red and blue wavelengths) Acuity - ANSWER-expresses sharpness of vision What does 20/20 vision mean? - ANSWER-at 20 ft, can separate contours roughly 1.75 mm apart (equivalent to 6/6). What does 20/200 mean? - ANSWER-at 20 ft, read letters most people can read from 200 ft away (considered legally blind) Describe the Snellen Eye Chart. - ANSWER-E at the top, other letters of the alphabet getting smaller as it goes down Describe the Tumbling E Chart. - ANSWER-lots of E's that face many different directions (useful for situations where someone might not be able to pronounce letters) Describe the Jaeger Eye Chart. - ANSWER-small hand-held card with texts of various sizes printed. Used to determine near sighted -from J.1. (20/23) to J. 20 (20/something worse) Addition - ANSWER-difference in plus power between reading and distance portions of multifocal lens Amblyopia - ANSWER-loss of vision w/o any apparent eye disease (lazy eye) Ametropia - ANSWER-refractive error of eye where, in resting state, does not focus image of object upon retina What eye problems can ametropia cause? - ANSWER-Hyperopia (farsightedness), Myopia (nearsightedness), and Astigmatism Aniseikonia - ANSWER-condition where there is significant size difference between the two perceived image If severe, the two images cannot be fused into a single impression