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Material that makes contact lenses

2007-05-06T00:26:00.000-07:00

Up until the late 1970s, contact lenses were made from two materials. Hard contact lenses were made of polymethymethacrylate (PMMA), while the soft contact lenses were made of a hydrated polymer, hydroxyethylmethacrylate (HEMA), which contained 37.8% water by weight. These lenses provided clear vision and comfort, but there was a problem. These lenses did not allow oxygen to reach the cornea. Because of this, the cornea could change, adversely, in some contact lens wearers.

PMMA is now obsolete, and is replaced with rigid plastics, mostly hydrophobic materials with high oxygen permeability. These lenses are called Rigid Gas Permeable (RGP) lenses. For the manufacture of soft lenses, HEMA is being replaced by polymers which contain as much as 80% water. These soft lenses, often called hydrogels because of the amount of water have high oxygen transfer while retaining shape despite high water content. These new materials used in the manufacture of contact lenses as well as thinner lenses and greater oxygen transfer has reduced corneal issues, but there are still other possible complications.
The new materials have also been instrumental in the creation of disposable contact lenses in a variety of types. Disposable contact lenses come in monthly, bi-monthly, weekly, and even daily disposable types. The thinner materials make wearing these contact lenses more comfortable, and the cost of contact lenses has been reduced. This allows for close to maintenance free contact lens wear.
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Laser Eye Surgery

2007-05-04T11:08:00.000-07:00

Laser eye surgery can correct common vision problems. With refined techniques and specialty equipment. These procedures generally involves the reshaping of the cornea to alter the way and place light enters the eye. Results are usually favorable with these procedures, however patients may not achieve the perfect vision they want. In these cases, patients may want to wear contact lenses or glasses. Even if patients have worn contact lenses before the surgery, they will require a new prescription and new fitting due to changes in the eye. The new prescription may be for soft or disposable contact lenses in a specialty variety because of altered eye and cornea shape.

Photorefractive Keratectomy, LASIK, Laser Thermokeratoplasty are the 3 types of laser eye surgery. Want to get more FREE info about the types of surgery? Click HERE to visit our website for FREE info and DISCOUNTED contact and color contact lenses!

Contact Lenses Types

2007-05-02T20:00:00.000-07:00

Today, contact lenses are small thin plastic disks designed to correct vision by changing the way the light enters the eye by altering the curvature of the cornea. The contact lens covers both the iris (colored portion of the eye) and the pupil (the dark center of the eye). Contact lenses correct mostly Myopia (nearsightedness), Hyperopia (farsightedness), Astigmatism (irregular shape of the cornea, causing skewed vision), and Presbyopia (caused by natural aging of the eye). Contact lenses are about the size of a button and are held in place on the eye by the eyes own natural tears.

Perfect and clear vision occurs when light entering the eyes through the cornea and converge at an exact point on the retina, or the back of the eyeball. Only about 4 in 10 people have this vision. Due to eye and cornea shape, size and distances, it may be necessary for vision to be corrected through the use of lenses.

Spherical and Aspherical Contact Lenses, Toric Contact Lenses, Bifocal Contact Lenses are the common types of contact lenses.
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2007-05-02T19:58:00.000-07:00

Join our Referral Program!

Want to earn money? You can earn money by referring friends to our web site. You will receive 3% commission on all sales originating from the customers you referred to the site. Your referral commission will automatically be used as a credit on your next purchase. You may monitor your commissions by reviewing the Referral Statistics Report. Click for more details.

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Do you how to read your soft contact lenses prescription?

2007-05-02T19:55:00.000-07:00

A contact lenses prescription is not the same as an eyeglass (spectacles) prescription. In addition to your lens power, your contact leness prescription contains information relating the size of the lens to your eye. You may also find your prescription printed on the packing in which your contact lenses were supplied.

A typical contact lenses prescription looks like this :

Acuvue 2
Eye Power (Sphere) BC (Base Curve) DIA (Diameter)
OD - 2.50 8.7 14.0
OS - 2.00 8.7 14.0

OD = Right Eye OS = Left Eye

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Contact Lens Fitting

2007-05-02T19:36:00.000-07:00

Because contact lenses are in direct contact with the eye, they need to be fitted to the shape of the eye. Many factors can affect the type of lens you need to be fitted for, including purpose, Astigmatism, some colour, and other eye issues.

You cannot use your regular eyeglasses prescription to get contact lenses. To wear contact lenses, there are other special measurements that need to be taken. Like clothing and shoes, contact lenses are not 'one size fits all'. Also, size can vary depending on the manufacturer of the lenses.

You can wear contacts for many vision correction problems, even if you have had refractive surgery. Because the contour of the eye has been altered, the contact lens will need to be fitted again and may require a more specialized lens than normal.

Coloured contact lenses are fitted like normal lenses. Because of this, it may be possible to see some of the colour of the lens overlapping the pupil. This can be a problem for lens wearers who want opaque lenses. Because opaque lenses have a solid colouring to completely change the eye colour of the wearer, vision can be affected and limited when the pupil becomes larger, such as in dimly lit environments and while driving at night.

Discuss all of your contact fitting options with your eye care professional.

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