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There are three types of soft contact lenses, rigid and semi-rigid.
Both soft and rigid contact lenses can correct myopia, hypermetropia, astigmatism and presbyopia or eyestrain:
- Myopia is a defect characterized by blurred distance vision. People suffering from myopia have difficulty focusing on distant objects.
- Hyoperopia is a defect that causes blurred near vision and eye fatigue.
- Astigmatism is the difficulty to focus on details both near and far. For example, people with astigmatism may find it difficult to differentiate between the letter R and the letter B at a distance and see them as similar.
- Eyestrain is a refractive defect that generally affects the near vision of people over 40 years of age.
Rigid contact lenses are made of hard plastic, while soft contact lenses are made of a softer material: hydrogel or hydrogel-silicone.
The most commonly used are soft contact lenses, but this does not mean that rigid lenses are not a correction option. Let’s look at the differences between them:
- although rigid contact lenses let more oxygen into the eye and are more hygienic because the material they are made of is not friendly to bacteria and residues so they don’t t tend to adhere to the contact lens.
- Although rigid contact lenses are better, they are not comfortable to wear at first, while soft contact lenses feel much better. Rigid contact lenses need some adjustment time to get used to the sensation of wearing the contact lens. Soft contact lenses on the other hand, the comfort is practically instantaneous.
- Hard contact lenses are worn conventionally,this means that the contact lens is replaced after about 2 years. While soft contact lenses need to be changed after a month of use at the most.
- Both soft and hard lenses have storage and cleaning systems. Rigid contact lenses need a special soap to rub them and then rinse them with saline solution and keep them with preservative liquid. Soft contact lenses only need to be stored in preservative liquid and rubbed a little before use. For soft contact lenses there are special liquids in which you only have to leave the lenses in the liquid without rubbing, this way, when putting in the contact lenses it is much more practical. In general, we can say that both contact lenses require disinfection systems and you have to be very demanding when using both soft and hard lenses.
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