Contact Lenses
A contact lens is a thin lens placed on the cornea to correct a refractive error or change eye colour. Fitted under an eye doctor's supervision and used according to the rules, lenses can be worn without problems for many years.
What is a contact lens?
A contact lens is a thin lens placed on the clear front surface of the eye (the cornea). It is mostly used to correct short-sightedness, long-sightedness and astigmatism, sometimes to change eye colour and, rarely, to treat certain eye conditions.
Types of lenses
- Soft lenses: the most widely used type; easy to get used to.
- Gas-permeable (rigid) lenses: mainly used in special situations such as keratoconus.
Possible risks
Lenses are in direct contact with the eye surface. Careless or unsupervised use can lead to:
- Serious eye infections
- Scratches on the cornea
- Inflammation of the cornea (keratitis) and corneal ulcers
If you develop redness, pain or reduced vision while wearing lenses, remove them and see an eye doctor.
Choosing the right lens
A glasses prescription and a contact lens prescription are not always the same; the diameter and curvature of the cornea also affect lens choice. Unsupervised lenses, such as those bought online, often cause problems. Have your lenses fitted by an eye doctor and follow the cleaning and wearing rules.
Frequently asked questions
Can I buy lenses using my glasses prescription?
Not always. Corneal diameter and curvature also matter, so lenses should be fitted by an eye doctor.
When should I see a doctor while wearing lenses?
If you have redness, pain or reduced vision, remove the lenses and see an eye doctor.
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This page is for general information only and does not replace a medical consultation. Anatomy and treatment plans differ from patient to patient.