Sol Óptica

Low vision

How to detect?

  • When it is difficult to recognize the features of friends and relatives.
  • When it becomes difficult to read, cook, sew or order. Objects may appear blurry, spotty or even deformed.
  • When doing your usual activities at work or at home become more and more complicated.
  • A strong decrease in visual acuity
  • And / or a visual field loss



How to correct?

The optician may recommend rehabilitation and also prescribe visual aids such as magnifiers, electronic magnifiers ...


How it works?

  • You can compare the human eye with a camera:
  • The camera and the eye both consist of several lenses. The eye is the cornea and lens.
  • The diaphragm of the camera could be compared with the iris (colored part that gives the eye). Its diameter varies from others in terms of luminosity.
  • As a camera, the eye makes a set-up to get a clear picture: the accommodation (the lens is curved under the action of the ciliary muscle).
  • The film could be compared with the retina (where the image is formed of the object).
  • The brain receives information from each eye along the optic nerve, interprets the two images and merges them. This principle is indeed comparable with the development of a negative.


Two eyes:

One image every one of our two eyes to the brain sends a signal from the object seen. It then merges the two signals and produces and binocular vision. Binocular vision can then see in three dimensions, is what is called "perception of relief."
So the eyes can be directed simultaneously towards the same object, synchronized action is essential six extra-ocular muscles of each eye. Is the coordination of the muscles that produces eye movements.
If this movement of the muscles acting on the eyeball is not synchronized, there is the deviation of one or both eyes. Then we talk about strabismus.

The visual acuity
Visual acuity measures the eye's ability to recognize one character at a given distance. These characters are called optotypes. It can be letters, numbers or symbols created for this measurement.
The measurement of visual acuity is based on the smallest optotype that the person is able to decipher at a given distance, for example 6/10 °, 10/10 °, 12/10 º. The usual process is to ask the person who read optotypes one by one, from largest to smallest.
The relationship between the distance at which the test card is of the same size and allows to define the visual acuity.