Pros and Cons of Contact Lenses

Many people choose to wear contact lenses to correct their vision instead of eyeglasses. Contact lenses are thin transparent plastic discs that sit on the cornea of the eyes. They stay in place by sticking to the tear fluid on the surface of the eye.

 

 A general understanding of the human eye is needed to understand how contacts work. Light rays are reflected off the object that a person sees and enters the cornea (the front part of the eye). The cornea bends the rays that pass through the pupil and the iris regulates the amount of light present. The light rays then pass through the lens of the eye which changes shape to bend the rays and focus them on the retina located in the back of the eye. The contact lens, which is placed on the surface of the cornea, cause these rays to adjust to focus on the image in the retina.

 

There are different types of contact lenses and each has its own advantages and disadvantages. Rigid gas-permeable lenses let oxygen pass through to the eyes. They correct most vision with a short adaptation period and are available in bifocal form.  However, these lenses may slip off the eyes easily and allow debris in.

 

Soft contact lenses, like the rigid gas-permeable lenses, allow oxygen to pass through to the eye. Soft contacts tend to be more comfortable than rigid gas-permeable lenses. But these lenses require regular check-ups and don’t correct all vision problems.

 

Extended wear lenses are available for overnight wear and can be worn up to seven days without removal. Extended wear disposable lenses last long as well and need little to no cleaning. They have minimal risk of eye infection. Despite these advantages, extended wear lenses do not correct all vision problems and can be difficult to care for.

 

Pros and Cons of Contact Lenses

 Contact lenses play a role in helping treat eye disorders. One such disorder is keratoconus. This is a condition in which the cornea thins and results in a bulge in the eye. Keratoconus is most effectively managed by using contact lenses. Hard, gas-permeable contact lenses are commonly used. Contacts can also be used to treat other eye diseases such as astigmatism. Astigmatism causes blurred vision due to an irregular shape of the cornea.

 

Contact lenses don’t cause magnified distortions like glasses do. They follow the curvature of the eye which provides a wider view and fewer distortions. Contacts are also extremely beneficial when doing outdoor activities and sports by providing a wider field of view and eliminating the need to wear easily breakable glasses.

 

 Contact lenses may be more convenient for some, but they can lead to eye infections. One such infection is keratitis - an infection of the cornea. This can be caused by poor maintenance of contact lenses as well as sleeping with them in. People who wear contacts need to treat them with great care and be very responsible. Hands should be washed before coming in contact with contacts or the eye, and the lenses themselves must be cleaned daily.

 

 Improper use of contacts can lead to eye infections and irritations or in extreme cases, blindness. However, ophthalmological technology is leading to safer contact lenses and are healthy for use by people of all ages, assuming they treat their lenses and the eyes with proper care.


Written by Irene Ok

  


Works Cited

• http://www.allaboutvision.com/contact-lenses-teens/

 

•http://voices.yahoo.com/facts-contact-lenses-pros-cons-eye-care-5914210.html?cat=5

 

•http://www.allaboutvision.com/contacts/faq/contacts-vs-glasses.htm

 

•http://physics.stackexchange.com/questions/1037/how-do-contact-lenses-work

 

•http://health.howstuffworks.com/wellness/cosmetic-treatments/contact-lens.htm


 

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