Symptoms of the disease
People with nearsightedness or farsightedness notice a deterioration in the clarity of images in very different situations. So if you have difficulty distinguishing distant objects and have to squint to see letters, you should find out whether you are nearsighted or farsighted. Another symptom is sudden eye strain, which can occur when watching films, driving or playing sports. With farsightedness, you can only see distant objects clearly, and to read a line in a book you have to squint and move the object as far away from your eyes as possible. In both cases, a visual acuity test will help to determine the extent of the condition and take appropriate action. It should be noted that vision tests can be done at home using a website with a test chart.
Causes of reduced vision:
- Heredity;
- Eye strain due to poor lighting, lack of breaks from visual work and other factors – check your child’s vision if you notice them squinting all the time;
- Lack of essential micronutrients in the body;
- Ignoring signs of the condition;
- Wearing corrective lenses or glasses incorrectly;
- Decreased muscle strength;
- High intracranial or intraocular pressure;
- Strabismus, astigmatism and other conditions.
Severity of the condition
In some cases, people with myopia may experience blurred images. In most cases, this is due to the elongation of the eyeball, which causes the retina to move away from its normal focal position and the image to “float”; a second cause is excessive refraction of light rays by the lens and cornea. An optician can determine the extent of the condition by testing your visual acuity for myopia.
There are several tests for nearsightedness. In short-sightedness, the distance between the focus and the retina does not exceed 3 dioptres and the length of the eyeball is about 1.5 mm different from the norm. On average, the eyeball is 3mm longer and the distance in second degree myopia is between 3 and 6 dioptres. Myopic (short-sighted) vision does not allow you to see much further than 30 cm from the eye. The focus is more than 6 dioptres away from the retina. The retina and blood vessels are very thin and the sclera is visible. When the arm is outstretched, only the fingers are visible.
Coping strategies
If you have signs of reduced vision, you should have a myopia test. It is now possible to do a myopia test online. For example, the Duochrome test is used to detect nearsightedness or farsightedness and test your vision.
To get reliable myopia test results, you just need to follow the rules below:
- The myopia test should be performed in good physical condition;
- Test your vision in a well-lit room with a properly installed monitor;
- Do not tilt your head or squint your eyes.
You can test your vision at home using the special charts. The online vision test does not require any outside help. All you need to do is print out one of the charts and place it at a distance of 5 metres from your eyes. The test should start from the line of ideal vision and move downwards. To check for astigmatism, a special test is used to detect this condition. The result of a vision test is not exaggerated even for people who have no obvious problems.
Regular tests are useful for all computer users. If the test reveals a condition, it is recommended that you see a specialist who can prescribe appropriate treatment to reduce your vision.