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 Designer Glasses Online – How The Eye Works

The eye is an elaborate photoreceptor, which detects information in the form of light from the environment and transmits this information by a series of electro-chemical changes to the brain. The part of the brain that processes this information is called the visual cortex.

If you look at the cross section below of an eye, you will see that it consists of a protective globe, the eyeball, with a central cavity that is divided into three parts. Information in the form of light, which represents what you ‘see’, is transmitted to the brain by the optic nerve. “Designer Glasses Online”

Designer Glasses Online

Test your own field of vision with compliments Designer Glasses Online

You can test your own field of vision. Although this is not a substitute for the optician’s examination, it can be a useful indicator.

1. Close or cover your left eye and stare straight ahead at a point on a wall with your right eye

2. Hold your right hand about 30 cm (1 foot) away from your right ear over your shoulder

3. Gradually move your hand forwards, whilst at the same time moving (wiggling) your fingers

4. You will become aware of the movement at the edge of your vision

5. Repeat the manoeuvre, bringing your hand up from your waist, then down from your head and across from your left hand side

6. You should see farthest out to your right hand side and below (the view to the left and above will be restricted by your nose and eyebrows)

7. If you cannot see your moving fingers until you bring them directly in front of your eyes, you have lost your peripheral vision

8. If your field of vision is normal, there is one point at which you will not see your moving fingers – this is your blind spot

Find your blind spot

You should now see a spot and a cross on the screen.

Close your left eye and look at the spot with your right eye.

Gradually move closer to the screen whilst looking at the spot.

You will notice that the cross disappears when you get to between 15 cm and 30 cm (6 and 12 inches) from the screen.

Repeat by closing your right eye and looking at the cross with your left eye.

The spot will disappear from your view at about the same distance as before.

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