ASPECTS OF VISION FOR
These are the visual abilities which are particularly important if players are to excel at football.
ACCURACY OF VISION
Accuracy of vision or how well you can see the position of the ball, the flight of the ball and its intended destination. The quality of your vision can be measured by determining the smallest object seen is (static visual acuity) how well moving targets are seen (dynamic vision). Any short or long-sightedness may need to be corrected.
Depth perception is the appreciatio f depth and helps you judge how far you need to kick the ball or the relative positions of other players on the field. Your assessment can be accurate only if both eyes are controlled precisely by the eye muscles and accurate measurements can now be taken using sophisticated computer software in the Practice.
Foot-eye co-ordination is essential to help you kick the ball exactly as intended. The head is rarely still and the brain has to inform the eyes about the current positioning of the head so that the eyes can compensate.
Eye movement speed and accuracy helps you gauge exactly the relative locations of the ball as it flies through the air and its likely destination if you are to make a well-judged contact either with head or boot. The following of a football requires slow and smooth (pursuit) eye movements, more useful to a goalkeeper than an outfield payer, while moving the eyes from one object to an other (saccadic movement) is a much faster ability (about 500 degrees per second).
Peripheral vision is necessary for you to be aware of other players whether in your team or the opposition's, as you are about to pass the ball.
When at West Ham and only 13 years old, Bobby Moore received coaching from Malcolm Allison who insisted that Moore should know at every instant of a match what he should do if the ball suddenly came to him. This was directly related to an awareness of the position of other players on the pitch and Ron Greenwood during a practice match would blow his whistle and Moore would be the only one to know exactly where all the players were. So good was Bobby Moore's peripheral awareness that Jock Stein, the legendary manager of Celtic, used to say about Moore that he would see things half-an-hour before anybody else.
Contrast sensitivity is the ability to see clearly in dull conditions or being able to pick out players or the goal posts in poor visibility.
Eye-hand reaction time is particularly important for goalkeepers. It has been demonstrated that top goalkeepers do not watch the opponent's foot or even the ball but they watch the attacker's knee.
Glare recovery is the ability of the eye to see well after viewing a bright light source such as the sun or when the floodlights are in use at night matches.
The accommodative facility is important when trying to focus on a ball before heading it and being aware of where the ball should be directed.