COA Visual Fields Questions and Answers Already Passed

COA Visual Fields Questions and Answers Already Passed 2 advantages of computerized static theshold perimetry over kinetic perimetry More sensitive at detecting small or shallow defects in the VF; can eliminate the burden on the tech for actually performing the test 2 advantages of kinetic perimetry Easy to understand and produces pictorial results that are easy to interpret 2 Main functions of perimetry To detect abnormalities in the VF and monitoring diseases of the eye in the visual pathways. 2 main types of pathologic changes in the VF Generalized defects and focal defects 2 methods of static perimetry Suprathreshold perimetry, threshold perimetry 2 types of refrence coordinates used for mapping the visual field Circles of eccentricity, radial meridians 3 main tests used in kinetic perimetry Confrontation field, tangent screen test, Goldman perimetry 4 disease conditions that may produce generalized depression of the VF Glaucoma, retinal ischemia, optic nerve atrophy, media opacity (cataract or corneal scarring) 5 main features of a focal defect that may be noted in mapping a VF Location, size, shape, depth, slope of margins Absolute scotoma an area that couldn't elicit a response to the largest, brightest test object on a particular machine. Altitudinal scotoma or hemianopia When a nasal step and arcuate scotoma join and enlarge to cause loss of the entire upper or lower VF. Bjerrum scotoma A small area of reduced sensitivity that appears at about 15 degrees of eccentricity in the upper or lower field. May form into an arc-shaped area called an arcuate scotoma if glc progresses.