Traditional eye tests only provide a small amount of information about functional vision. In addition to the traditional measurement of visual acuity, people also want to know how wide, clear and fast their vision is, to really understand the capabilities of their functional vision. All those factors have a great impact on how people perceive their environment and are able to function in it.
Visual acuity is necessary for recognizing objects, and it is measured through tests of distance vision, terminal vision and near vision. The test results determine whether the current glasses of your customer are good enough to recognize objects at various distances, or whether your customer needs glasses at all.
CLARITY OF VISION
The clarity of visual field is necessary in order to distinguish objects from their backgrounds. One needs to be able to perceive lights, shadows, and shades. This is called contrast vision. A lowered contrast vision can lead to various kinds of challenges. For instance, it may be hard to see edges of the stairs and staying balanced when walking up and down the stairways. It may be difficult to determine the shapes of different objects. Or, when one is skiing, hills and bumps may not stand out well enough in one’s vision. Dim lighting and poor weather conditions can make things even worse.
SPEED OF VISION
The speed of vision stands for the pace at which your eyes, brain and hands operate together, and for the processing speed of the neural functioning. This is called vision-based reaction time. If the sensory impressions take too long to process, the vision is not efficient. This can have serious consequences, for example when driving in traffic. Also, all kind of sports frequently require swift reactions.
FIELD OF VISION
A wide and even visual field is important for the full functionality and the general quality of our lives. Attentive persons are constantly observing their surroundings with the help of visual field, sharp vision area, eye movements and identification of targets for visual decision making. This team play creates a person’s perception field.
The eyes of a human being were born to move. Our eyes move several times per second. However, our visual perceptions are not limited to the direction of our look – in other words, our sharp vision area. Our brain receives information from the whole area of the visual field while planning the next movements.