Testing visual function


Testing central visual field  

QDo you understand the role of the central 20% of your visual field? Do you know what the fovea is and its importance?

The effects of losing central vision… tbd

QDo you have trouble distinguishing colors?

This most likely does not mean you are “color blind.” Because the highest density of cones is found in the macula, with the degeneration of the macula it may become hard to distinguish, for example, between blue and black socks.

QDo you find it hard to make eye contact? Do you not recognize faces?

Looking someone in the eye you are using the macula, and with the degeneration of the macula it becomes difficult to make eye contact.

Here’s a quick way to simulate loss of central vision

Close one eye and hold your fist in front of it, about 5 inches away. Note that you can still see, but you can’t identify anything the fist is hiding.  As you move your fist closer to your eye you’ll see how you lose more of the central view.  Do this experiment while looking at someone’s face; you can see the problem!

This is an example of a real-life experience that can be retained by learning new skills to make up for loss of central vision; in low vision training you can learn to reposition your eyes, to use areas outside the macula.

QDo you experience difficulty with details?

In low vision therapy you can learn about magnification tools and technology, how to situate yourself for optimal seeing, and training in scanning and eccentric viewing.