Eye Movements Flashcards
act of aiming the eye or eyes at a specific spot.In normal eye the image is centered on the fovea, where it will best be seen
Accurate ______ and _____ stability are important in keeping our world clear so objects can more easily be identified.
-keeps image steady and centered on fovea where best be seen
-maintenance a key factor in sustaining va
-if you have poor___ reduced accuracy in accom response is seen
Fixation
ability to maintain fixation
Following a moving target, relatively slow movement
Smoothly, accurately and effortlessly
- Relatively slow movement
-ability to moves ones eyes smoothly and accurately and effortlessly together for example a baseball soaring over fence ( version)
Pursuit
Voluntary change in fixation from one point to another in the visual field. ( fasted movement in the human body)
- quick movements eye jumps one target to another
Saccades
Refractive error in which the point of focus is in front of the retina. Eyes are in focus for near objects but cannot see a distant object clearly Correctable with a concave lens. ( Minus)
Myopia- (nearsighted
Refers to a refraction error in which the point of focus for rays of light from distant objects in behind the retina. Correctable with a convex lens ( plus)
Hyperopia-( farsighted
A distortion of the curvature of the cornea or symmetry of the components of the eye, such the rays from a single point are not focused at a single point on the retina
Astigmatism
Decreasing ability, due to age, of the lens of the eye to focus for near objects
Presbyopia
A condition of unequal refractive status for the two eyes
Anisometropia
Voluntary generated in search of or in anticipation of a target appearing in a specific location
Predictive saccades
Voluntary generated to the location in space where a target has been previously viewed
Remembered saccades
Generated in response to unexpected novel stim in the environment may be visual auditory or tactile
Reflexive saccades
