A visual challenge, the 'Spot the 409' test, requires participants to find a single '409' amidst numerous '406's within seven ...

This is an image to demonstrate visual 'crowding' and test peripheral vision. Ensure that the red dot in the centre of the image is at eye level and focus on it. While holding your focus on the red ...

This is an image to demonstrate visual 'crowding' and test peripheral vision. Ensure that the red dot in the centre of the image is at eye level and focus on it. While holding your focus on the red ...

In the specialized fields of ophthalmologyand optometry, doctors measure sight by having you focus on a central point while keeping your head still. You’ll also be able to see above and below the ...

Glaucoma, one of the leading causes of permanent blindness, often does its damage silently - with no noticeable symptoms - as vision is lost. Glaucoma affects an estimated 3 million Americans, but ...