What is presbyopia?
Older people are well aware of what presbyopia is. This visual impairment is a consequence of the aging of the human body.
Presbyopia is a disease in which the ability of an eye to focus on small objects is deteriorating. It occurs mainly in people over 40 years of age as a result of age-related changes in the lens of the eye (loss of tissue elasticity, compaction, dehydration, etc.) This is why people have to wear glasses in their mature years. You can learn more about the functioning of glasses here: How glasses work
In the people, this disease is also called senile hyperopia.
Causes of Presbyopia
Presbyopia occurs in the process of natural aging of the lens. With age, its important function of focusing objects deteriorates. The lens condenses and loses its former elasticity, as a result of which it can no longer change its curvature well enough for a clear image of distant and close objects.
Symptoms of Presbyopia
- A person constantly has to strain his eyes to focus his vision on the desired object.
- Simple activities such as embroidering, reading books, working at a computer or watching TV can cause you to feel unwell, headaches and eye strain.
- People suffering from presbyopia, try to push objects away from themselves in order to better see the image. This applies to computer monitors, books, mobile phones and other devices.
- Reading Glasses. If you do not know what glasses are for, this is the answer: this is the simplest and most affordable way to correct vision. Glasses with bifocal lenses are best suited - their upper part is adapted for distance vision, and the lower one - for near distance. A modern analogue of such glasses are progressive lenses. In them, the boundaries between the lower and upper parts are maximally blurred, which makes it possible to see at almost any distance.
- Contact lenses. Apply gas permeable and multifocal lenses. Their central and peripheral zones are designed to view at different distances.
- Surgical intervention. Here are some ways that are used in modern medicine:
- Thermokeratoplasty. With the help of a laser, the curvature of the cornea on one of the eyeballs is changed.Thus, a monovision is obtained (one eye sees for short distances, the other for long distances).
- Multifocal LASIK. With the help of a special cornea laser, separate zones are created for viewing at different distances.
- Replacing the lens. The native lens of a person is replaced with an artificial one.
Sarah Jessica Parker told who will play Samantha Jones
Where is the Oka
How to understand that relationships are exhausted
Released the trailer Very bad moms - 2
How to draw mom