Factors of contact lenses

Factors of contact lenses

Factors of contact lenses

Present now, a large group of individuals choose to wear contact lenses for vision correction, rather than the other two solutions including eyeglasses and laser eye surgery. It is well-known that any of these three solutions has its own pros and cons. Eyeglasses may become cumbersome to wear, because they can be easily broken and get scratched in the lenses or being stuck with frames. And some people just do not like their unnatural look. And for some folks, laser eye surgery is not suitable. Surgical solution is also quite expensive and involves certain risks.

Contact lenses are commonly selected to correct refractive errors such as nearsightedness, farsightedness and astigmatism. There is much knowledge that should be known while choosing proper contact lenses. Only a proper pair of contact lenses can ensure right vision correction, eye health and comfort.

In general, contact lenses come in two categories: soft and rigid. Hard or rigid contact lenses were the only choice in the past. This type requires longer time of adjustment. Soft contact lenses are generally more comfortable than rigid ones. On the current market, soft lenses are the majority. They are more and more popular due to their convenience, comfort and cost effectiveness.

When it comes to wear interval, there are daily wear contact lenses and extended wear lenses. Daily ones are more usual that they are worn for one day and removed before going to bed. Extended wear lenses can be left in the eyes during sleeping. From the view of replacement interval, contact lenses can be classified into daily disposable lenses, two weeks or monthly wear lenses and even longer ones. In general, contact lenses replaced every two weeks or monthly are the most popular. There are special contact lenses for other vision problems such as presbyopia and astigmatism.

Except for lens types, other factors of contact lenses should also be considered. Contact lenses usually require proper care and handling on a daily basis. Only daily disposable lenses need very little care or no care at all. As special visual devices, contact lenses can never be worn for a longer time than prescribed.

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