Contact Lens - Their Features & Their Use

Contact Lens

Contact lenses are small visual devices made with curved pieces of plastic shaped in a way to conform directly to the wearer’s eye. They provide an artificial refracting surface to the human eye and are used to correct vision problems like myopia and hypermetropia. Contact lenses aid in eye focusing in the same manner as spectacles do. Apart from these corrective measures, contact lenses can also be used for cosmetic and therapeutic reasons.

Features of Contact Lenses

The lenses are made from different types of materials – soft and rigid – and come in a variety of designs and colors. These include disposable, colored, astigmatic, aphakic, presbyopic and keratoconic lenses. The initial fitting and follow up care are important parts of contact lens usage to give maximum benefits of vision, appearance, comfort and tissue integrity.

Advantages of Contact Lenses

Contact lenses are capable of correcting most of the problems that spectacles can as well as some additional ones that glasses cannot.

People not satisfied with their appearance using glasses can opt to use contact lenses for improved appearance. Contact lenses are not in the danger of slipping off, getting wet, or fogging up, which can easily happen with spectacles.

Uses of Contact Lens

The primary use of contact lenses is to correct myopia (short sightedness). They can also be used to rectify hyperopia, astigmatism, presbyopia and aphakia. Rigid lenses are used to correct irregular corneal trauma. Soft lenses are used as bandages for conditions like bullous keratopathy, recurring corneal erosion as well as to increase comfort, vision and postoperative wound healing.

The Adverse Effects of Contact Lenses

People have difficulty in using contact lenses if they have eye irritations due to allergies or dust and chemicals. Overactive thyroid gland, severe diabetes or extreme arthritis in the hands, dry eyes related to pregnancy, contraceptives, diuretics, antihistamines and decongestants and eye disease prevents a person form using contact lenses.

The usage of contact lenses may give rise to problems like eye infections, allergic reactions to lens care solutions and deposit on lenses, redness of the eyes, scratched corneas, alteration in corneal shape and structure and abnormal blood vessels growing in the apparently clear cornea. You should consult your eye specialist without delay if there is burning, extreme sensitivity or hazy vision or pain.

Can I Use Eye Drops With My Contact Lenses?

Yes. Certain eye drops can be used with contact lenses. Most over-the-counter eye drops are divided into three categories: “dry eye" eye drops, “get the red out” eye drops and “contact lens” eye drops.

• "Dry eye" eye drops:
  
  
  Dry eye drops come in a variety of formulations. Some are thicker than others and may actually cloud your vision or “gum up” your contact lenses. While some of them may be okay for use with contact lenses, they are designed to not only lubricate the eye, but to promote healing of the eye’s surface.
• “Get the red out” eye drops:
  
  
  "Get the red out" drops have special ingredients called vasoconstrictors. These drops shrink the tiny blood vessels in the conjunctiva, the clear tissue that coats the white part of your eye. These eye drops could cause deposits to form of the surface of your contact lenses and if used repetitively to re-wet your contact lenses, could cause “rebound” redness. Rebound redness occurs when the vasoconstrictor wears off. The blood vessels dilate larger, causing the eyes to appear bloodshot. This may cause dependency or mask underlying infections or inflammations.
• "Contact lens" eye drops:
  
  
  Contact lens eye drops are often called re-wetting drops. Re-wetting drops lubricate your eye and hydrate the contact lens, making your eyes more comfortable while wearing your contact lenses. Theses eye drops are labeled “For use with soft contact lenses,” and are usually located next to contact lens cleaning solutions in the store. Eye care professionals usually encourage frequent use of re-wetting drops, as it improves comfort and helps clear out debris underneath your contact lenses.
Talk to your eye doctor if you are taking any eye drops for medical eye problems, such as glaucoma. Ask your eye doctor for the best way to insert eye drops and whether or not contact lenses should be worn while taking your medication.