Related articles: Myopia
Definition
Myopia is a refractive defect in which the light rays coming from a distant object do not focus correctly on the retina, but in front of it. This happens because the refractive surfaces (cornea and / or crystalline) of the eye have an altered radius of curvature or because the eyeball is longer than normal. Regardless of the causes, the consequence of myopia is that the objects observed tend to appear blurred, while the vision improves with the reduction of the distance between the eyes and the object.
Myopia can be associated with other ocular pathologies (eg cataracts, retinal detachment or glaucoma).
Most common symptoms and signs *
- Eye fatigue
- Burning eyes
- Night Blindness
- Headache
- Misaligned eyes
- Narrowing of the visual field
- Reduced vision
- Blurred vision
Further indications
The main symptom of myopia is the blurred vision of distant objects, while neighboring ones can be clearly seen. Usually, myopic patients squint their eyes and narrow their eyelids or frown to try to see better. For this reason, the symptoms associated with myopia include headache and visual fatigue.
The maximum distance that a myopic subject can see clearly is inversely proportional to the degree of myopia. The disorder can be easily identified thanks to an eye examination. The severity of myopia is measured in diopters: up to -3.00 diopters it is a mild disorder, from -3.00 to -6.00 diopters it is average myopia, while if it is greater than -6.00 diopters the defect is considered to be of high degree.
For the correction of myopia, a concave (negative) lens can be used, thanks to which the images are focused on the retina. Refractive surgery is also an option available to correct this visual defect.
