A myopic eye is an eye that is too long and has too powerful a cornea. One could also say that it is a too-convergent optical system. In either case, the optical consequence of myopia is that the image of a distant object is projected in front of the retina instead of on it.
The myopic eye is too long, and the images of distant objects are projected in front of the retina.
In the myopic eye, light rays from infinity are projected in front of the retina. Myopia is rare in early childhood and often appears before puberty, sometimes a little later. We even sometimes speak of “intellectual myopia” when it occurs later in students. If there are genetic factors in myopia, an intense reading or writing activity favors the outbreak of myopia with equal genetic equipment.
Myopia generally evolves a few years before stabilizing, most often before age 25 and sometimes much earlier. Some myopia can remain progressive until old age and reach a degree that speaks of high myopia. The degree of myopia (measured in diopters) is often confused with visual acuity expressed in tenths. These two data refer to two very different concepts:
The degree of myopia corresponds to the power of the glass necessary to correct myopia, and it is the figure which appears on the prescription intended for the optician. Below -3 diopters, we speak of low myopia. The term medium myopia designates myopias between -3 and -6 diopters. We speak of high myopia from -6 diopters.
The second corresponds to the visual performance of the eye, i.e., its ability to read the letters on the reading scale presented to it during the consultation from a distance.
However, there is a relationship between these two concepts that can be assessed approximately by understanding that each 0.25 diopter of myopia leads to a loss of vision of one line. Thereby:
- A non-myopic eye sees 10/10.
- A myopic eye of 0.25 sees 9/10
- A myopic eye of 1 diopter sees 6/10
- A myopic eye of 2 diopters sees 2/10
- A myope of 2.25 diopters sees 1/10
From 2.5 diopters of myopia, the eye concerned sees less than 1/10. This does not mean that he cannot see anything, but he cannot see the largest letters on the acuity scale at 5 meters, which is the regulation distance for measuring light. ‘Visual acuity.
In total, 4 concepts are important to remember:
– Retinal detachment with retina specialists near me is, above all, a disease of the myopic, in whom regular screening must be done, especially before age 40, because it is likely that areas of fragility appear in the first half of life.
– The appearance of symptoms of vitreous detachment (sudden onset mobile fly) requires a rapid ophthalmological examination regardless of the patient’s age.
– Retinal detachment is a surgical emergency in discover vision for example.
– The laser is a preventive and never a curative tool when establishing retinal detachment.
