Various types of contact lenses
Contact lenses are transparent, curved plastic objects that are placed on the outer layer of the eye, the cornea. The lens is usually used for the beauty and to change the color of the iris of the eye, or as the medical tool to correct eye defects treatment.
Types of contact lenses
There are two types of contact lenses, soft and hard. Soft lenses include: medical, colored and colored medical.
- Medical lens are applicable to people with myopia, myopia, or astigmatism.
- Color lens are used for beauty.
- Colored medical lenses are used for the beauty purpose of people with visual impairment.
- Therapeutic Soft Contact Lenses are placed on the cornea as a protector and is used for people with corneal ulcer or other corneal diseases.
Hard lenses are commonly used for people with high astigmatism or Keratoconus.
Contact lenses and their benefits:
- Contact lenses have more field of vision than glasses
- Objects with eye contact lenses are far better than glasses.
In addition to the benefits mentioned above, we focus on the lens and its complications:
Contact lenses and their complications:
- Corneal edema: Long-term use of the lens causes the cornea to suffer and swells, and usually people with low tears have this problem.
- Infection and redness: unsuitable lenses, not following hygiene roles or prolonged use of the lenses can cause discomfort.
- Corneal scratches: If the lens is not removed correctly, it will scratch the cornea.
- It’s a way to transmit infection, AIDS, hepatitis and …
- A small lens will result in a lack of proper oxygen to the cornea and a larger lens will slip the cornea up and down.
If your eyes are red, infected, eyelids are swollen; do not use any contact lenses. Colored contact lenses are forbidden for people who have allergy; if in the case of using lenses your vision is decreased, do not use them. They should be used exclusively for each person, and our recommendation is that even the use of beautiful and colored lenses should be under the supervision of the physician because otherwise the risk of damage to the cornea is high.
Researchers at the University of New York with a study by researchers who use lenses and those who do not use it, discovered that eye bacteria have changed over time, causing infection in the eyes while using eye contact lenses and the level of bacteria in their eyes is three times more than the ones who use glasses. The results of the study showed that the bacterium called pseudomonas, which leads to corneal ulcer, is higher in people who use lenses. According to researchers, 18 percent of Americans use eye contact lenses, 28 percent of whom use lenses without doctor’s permission. According to many recommendations, some people still sleep with eye contact lenses.
Summary:
Contact lens are very thin lens that are placed on the cornea, in addition to their medical usage, they have unique beauty. Beside their benefits they can cause many complications for the eye and cornea, many of which can lead to eye damage and even blinding. Therefore, for a proper use and minimize the injury of these lenses, it’s best to consult a doctor.
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