There are two major types of contact lenses on the market, soft contact lenses, and hard contact lenses, depending on the material used to make them. As the name implies, soft contact lenses are made of soft materials. They fit very tightly to the cornea with minimal foreign body sensation, making people almost forget they exist. On the contrary, hard contact lenses are hard and do not change their shape in accordance with the cornea, so the foreign body sensation is heavier and some people raise the white flag because they cannot tolerate the foreign body sensation.
If you are planning to start your own contact lens business, then Freshlady contact lenses supplier will give you a brief explanation of the differences.
Advantages and disadvantages of soft contact lenses
- Short adjustment period
- More comfortable to wear
- Good stability
- Intermittent wearers can wear them at any time
- Poor optical properties
- Easy to break, easy to deposit, difficult to clean, short life span (1~2 years)
- More likely to cause conjunctivitis
Advantages and disadvantages of hard contact lenses
- Good optical properties
- Good correction of astigmatism
- Long life span (3 to 5 years)
- Accessible to clean, low infection rate
- Long adaptation period
- Heavy foreign body feeling
- Easy to shift with large sliding
- Very afraid of sand and wind
How to evaluate the contact lens material
1. Oxygen transmission rate
The higher the oxygen permeability of the material, the less likely the cornea will be deprived of oxygen.
2. Water content
This is a term used exclusively for soft contact lenses (since hard contact lenses do not contain water). Generally speaking, the higher the oxygen permeability of a soft contact lens, the higher its water content, so the water content is sometimes used to represent the oxygen permeability. Therefore, the higher the water content, the better the oxygen supply. However, the higher the water content, the more it absorbs water, which can worsen the symptoms of dry eyes for people who do not produce enough tears.
Each type of contact lens has its own advantages and disadvantages, no one is the best. In addition to the product itself, personal physique, eye condition, wearing habits, lifestyle, and work environment may affect your choice. Therefore, no matter what kind of contact lens is available, the best lens is the one that fits the individual.