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. They are curved pieces of plastic shaped in a way to conform directly to the wearer?s eye. Contact lenses are not in the danger of slipping off, getting wet, or fogging up, which can easily happen with spectacles. The lenses are made from different types of materials ? soft and rigid ? and come in a variety of designs and colors. It includes disposable, colored, astigmatic, aphakic, presbyopic and keratoconic lenses. The primary use of contact lenses is to correct myopia (short sightedness). They can also be used to rectify hyperopia
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 would be in people with 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. Difficulty in using contact lenses is also seen if you have eye irritations due to allergies or dust and chemicals. Conditions that could arise due to contact lens use include 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.