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Physical visual and audio feedback is information provided to a user through a tangible, perceivable form. For example, a device that vibrates or lights up to indicate a notification is an example of physical visual feedback. Similarly, an audible sound or beep indicating an action or completion of a task is physical audio feedback.
things such as thumbs up, looking at the person while giving the feedback, things they can see
VIsual light
Regular eye exams are important to detect silent eye problems (e.g., glaucoma). Left untreated, glaucoma can result in blindness.
Sensation
The presence of light and our visual organs that detect that light.
A pap smear can't detect pregnancy.
An eye examination is a series of tests that measure a person's ocular health and visual status, to detect abnormalities in the components of the visual system
There are a lot of visual problems like, glaucoma.cataract,nystagmus,strabismus,retinal detachment, far sightedness and near sightedness.
computer animation
James G Trexler has written: 'The immediate effects of concurrent visual feedback on beginning target archers' -- subject(s): Archers, Feedback (Psychology)
Visual field tests (perimetry) can detect blind spots in a patient's field of vision before the patient is aware of them. Certain defects may indicate glaucoma.