David Thomas contact lenses Ltd

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Common Visual Problems:

MYOPIA: (nearsightedness):
This very common condition is found in more than two thirds of all individuals needing glasses or contact lenses. It results in blurred vision while viewing distant objects. It is caused by a steep cornea or an irregularly shaped eyeball.

HYPEROPIA: (farsightedness):
This condition, by definition, means vision is clear at a distance and blurry up close. In reality, that may or may not be true. It depends upon your age and also the power of your prescription. Glasses or contact lenses can easily help a patient with this condition.

ASTIGMATISM:
This condition is an optical state, not a disease. It is caused when the cornea is not perfectly round. Think of it as your cornea having a shape similar to the back of a spoon, with a steeper and a flatter curvature. Astigmatism is very common. In many cases, toric contact lenses can be fitted to sharpen vision. Gas permeable contact lenses also may be used.

CONTACT LENS TYPES:

Contact lenses can be divided into two main categories:

SOFT - These contain significant amounts of water, have larger diameters and, sometimes, offer greater comfort.
RGP - Rigid gas permeable lenses are made with special plastics designed to resist deposits and allow oxygen through to the cornea. They provide exceptional vision, particularly for those patients with significant amounts of astigmatism.

The above groups can be further subdivided into the following broad groups:

DAILY WEAR - These lenses are worn strictly during waking hours, cleaned daily and may require enzyme tablets on a schedule recommended by your optician.

EXTENDED WEAR - These lenses may be worn while sleeping. You must be very cautious, however, to follow the wearing and care regimen as prescribed by your optician. Eye infections are more common with extended wear lenses than daily wear.

DISPOSABLE - These lenses are worn for a given period, then thrown away and replaced with another set. Wearing disposable lenses beyond their recommended replacement schedule is hazardous to your eye health.

Many individuals unwittingly put their eyes at risk by not cleaning their lenses, sleeping in them, or not replacing them when instructed. Please do not make this mistake! Your eyes are just too important. At best, you may develop an eye infection eventually. You could also develop a sight threatening eye ulcer. So, stick to the schedule recommended by your Optician. For patients most frequently asked questions visit our FAQ Soft and FAQ RGP sections.