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| General |
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How does the Eye Work? -
Common Eye Conditions -
How does a Contact Lens Work? -
What Types of Contact Lenses are there? -
How Long Does It Take a New Contact Lens Wearer to Get Used to Contact Lenses? -
Which way is the Right Way to Wear Contacts? -
When Should Contact Lenses be Replaced? -
Contact Lens Safety -
Recommendations for using your Contacts: -
Cleaning and Storing Contact Lenses -
Are Contact Lenses Suitable for Sports such as Swimming?
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How does the Eye Work? Eyes do not actually see objects; they see the light reflected by objects. When these light rays enter the eye, they are absorbed and then converted into electrical signals by retinal nerves. In a person with normal vision, light rays enter the eye through the cornea (also known as the window of the eye), then are focused with the help of the crystalline lens. The crystalline lens is located behind the pupil at a point directly on the retina (the light sensitive nervous tissue at the back of the eyeball). These signals are subsequently sent to the brain where they are interpreted as visual images. Much like the way a camera works, when the eye is working you are able to see a clear picture. When the eye is not working properly, the picture is not as clear (there is a refractive error). Only about four in ten people have normal visual acuity. Refractive errors can be corrected with the help of eyeglasses or contact lenses.
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Common Eye Conditions Besides refractive errors that necessitate vision correction, there are a few common eye conditions that people can have. They are astigmatism, glaucoma, myopia, hyperopia and presbyopia. Astigmatism is a condition in which the cornea's curvature is asymmetrical-sometimes, this is described as the eye being shaped more like a football than a baseball. The eye is therefore unable to focus clearly. This can be corrected with toric Contact Lenses. Glaucoma is a condition in which the pressure inside the eye is elevated because of excessive amounts of fluid (aqueous humor). This can damage the optic nerve and cause a range of impairment, from loss of peripheral vision, or blindness. Chronic glaucoma usually begins in people over the age of 40. Myopia is also called nearsightedness. People with this condition can see clearly up close but not at a distance. Hyperopia, on the other hand is almost like the reverse of myopia. Also called farsightedness, people with this condition can see clearly at a distance but not up close. Presbyopia is a condition that usually affects people 40 and over. People with usually normal vision find it more and more difficult to read and do detailed work unless they're very close up. People with presbyopia can find help in the use of reading glasses, or bifocal or multifocal contact lenses.
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How does a Contact Lens Work? Contact lenses are a medical device, designed to fit right onto the cornea, and stay put with the eye's natural moistness (tears). Contact lenses can help reduce image distortion sometimes caused by eyeglasses, because they fit right onto the eye and offer increased peripheral vision. An Eye Care Practitioner needs to fit a patient for contact lenses, because all eyes are different sizes and all patients have different needs.
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What Types of Contact Lenses are there? An Eye Care Practitioner is the only person that can recommend and prescribe a particular type of contact lens to a patient. However, there are different types of contact lenses available with slightly different purposes.
| Daily-wear soft lenses Made of soft, flexible plastics that allow oxygen to pass through to the eyes. | - very short adaptation period
- more comfortable and more difficult to dislodge than RGP lenses
- available in tints and bifocals too
- great for active lifestyles
| | Daily-wear disposable soft lenses Single-use, daily wear lens that are designed to be worn for a single day, discarded at night, and replaced with a brand new pair. | - typically no lens care is required
- assures fresh and clean lenses when replaced
- great for active lifestyles
| | Extended-wear soft lenses Available for overnight wear. Made of soft, flexible plastics that allow oxygen to pass through to the eyes. | - can usually be worn without interruption, even while sleeping, up to a maximum number of days,
| | Frequent & planned replacement soft lenses Soft daily or extended wear lenses that are replaced on a planned schedule, most often every two weeks, monthly or quarterly. | - assures fresh and clean lenses when replaced
- available in most prescriptions
- spare lenses conveniently on hand
| | Rigid Gas Permeable (RGP) Made of slightly flexible plastics that allow oxygen to pass through to the eyes | - vision may be sharper than with soft Contact Lenses
- easy to put on and to care for
- durable with a relatively long life (1-2 years)
- available in tints (for handling purposes)
- daily-wear and extended-wear designs available
- planned replacement schedule also available
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How Long Does It Take a New Contact Lens Wearer to Get Used to Contact Lenses? Depending on a person's eye sensitivity and whether they have soft or rigid gas permeable (RGP) lenses, it could take from one day to two weeks. If there is irritation, the wearer should contact their Eye Care Practitioner.
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Which way is the Right Way to Wear Contacts?
Many first time wearers have questions about whether or not their contact lens is inside out. There is a way to tell-just place the contact lens on your finger so it's forming a cup, and hold it up directly in front of your eyes so you're looking at it from the side. If the edges are flared out, it's inside out; if it's forming a "U" shape, it's correct.
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When Should Contact Lenses be Replaced? If contact lenses are still comfortable and in good condition beyond the recommended replacement schedule, it is still advisable to adhere to the wearing schedule prescribed. The main advantage of disposable lenses is that a fresh pair is worn daily or every couple of weeks.
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Contact Lens Safety Doctors warn contact lens wearers not to share their contact lenses! Contact lenses are medical devices and are fitted to the specific patient's parameters. When shared or handled improperly, they can also transmit harmful bacteria that can lead to infection or other dangerous eye conditions. Patients should always follow their Eye Care Practitioner's advice on wear, care and disposal of contact lenses.
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Recommendations for using your Contacts:
DO: - Attend regular eye care checkups
- Wash and dry hands prior to handling lenses
- Clean, rinse and disinfect lenses after use (except daily disposable lenses, which should be discarded daily)
- Air dry lens cases/storage cases and keep dry when not holding lenses
- Insert lenses before applying makeup
- Remove lenses before removing makeup
- Replace lens cases/storage cases every 3 months to prevent contamination buildup
- Have spare lenses and solutions on hand
- Have an up-to-date pair of glasses available in case you need to remove your lenses
DON'T: - Use tap water on lenses
- Wet lenses with saliva
- Reuse disinfecting solution-always discard and replace with new solution each time lenses are stored
- Sleep in your lenses, unless specifically advised to by your Eye Care Practitioner
- Switch the type of solution you use except on the advice of your Eye Care Practitioner
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Cleaning and Storing Contact Lenses Contact Lens wearers should always wash their hands before handling their lenses, to avoid transferring dirt and germs to their eyes. They should also avoid moisturizing soaps, as they are not good for contacts. Hands should be dried with a lint-free towel. When one lens is removed, clean it with the recommended solution to remove eye-produced buildup, cosmetics, and other debris that impairs comfort. Some products require rubbing of the lens with a few drops of solution, while others only require rinsing. Rinsing is then required again to remove any loosened debris. Afterwards, the lenses can be placed in a clean lens case or holder, and filled with the appropriate solution for soaking and disinfection. Disinfection time varies, depending on product. These steps should be repeated for the other lens, and the lenses can be stored in the lens case.
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Are Contact Lenses Suitable for Sports such as Swimming? Contact Lenses can be the best vision correction option for athletes, enhancing visual skills like depth perception, peripheral awareness and eye/hand, eye/foot coordination. Unlike glasses, they offer a competitive advantage because they stay in place under dynamic conditions and eliminate the risk of injuries from eyeglasses. It is, however, best to not swim while wearing Contact Lenses, because of the bacteria in the water that can adhere to the lenses and cause infections. If lenses are worn while swimming, it is advisable to wear goggles over them and disinfect them immediately afterwards.
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