What is a contact lens?
A contact lens is a thin, curved lens that is placed on the film that covers the surface of your eye. The lens is naturally transparent but is sometimes slightly tinted to allow wearers to handle it more easily. Today's contact lenses are soft or rigid. Most people now wear soft lenses and until recently, contact lenses were made from blown glass!
Contact lens : transparent, very thin and concave optical prosthesis, which is placed on the cornea of the eye to correct vision defects.
There are 3 types of lenses according to your corrections
- Spherical : Correct myopia or hyperopia only.
- Toric (or cylindrical) : correct astigmatism, alone or in combination with myopia or hyperopia.
- Progressive : are lenses that combine several corrections into a single lens. They generally include a correction to discern very close objects, a correction to see objects clearly far away and a correction to cover intermediate distances. This design allows presbyopes to correct age-related vision problems when the eye can no longer accommodate nearby objects. However, while progressive contact lenses have many advantages, they also have their drawbacks. That's why, if progressive lenses don't seem to be right for you, know that there are other options, such as combining reading glasses with normal contact lenses
What type of contact lenses can I choose?
Benefiting from the latest innovations, contact lenses can correct myopia, hyperopia, astigmatism or even presbyopia. Cut on both sides according to the correction you need, they are placed in contact with the cornea.
There are different types of lenses :
- Traditional soft contact lenses are made of hydrophilic soft plastic material, containing 38 to 72% water. They correct all ametropia, even the strongest. Their flexibility offers immediate comfort from the moment they are installed. Maintained daily, they have a lifespan of 12 to 18 months.
- Frequent renewal soft contact lenses are lenses that you wear every day and remove at night, and are scheduled for renewal weekly or monthly. Because they are easy to clean and available in a wide range of optical corrections, they are the most widely used type of contact lenses today.
- Daily soft contact lenses are placed in the morning and discarded in the evening. The advantage : no maintenance! Generally, they are used in addition to the usual use of glasses : for those who practice a sport or on the occasion of a weekend.
Here are some of the best ways to help prevent complications :
- Consult your eye doctor if you are considering wearing lenses.
- Buy contact lenses from legitimate sources.
- Keep your lenses clean and well maintained.
- Follow all instructions regarding your lenses and lens products.
- Comply with your terms and conditions of wearing and renewal.
To preserve the quality of vision and good health of your eyes, each pair of lenses is manufactured and prescribed to be worn for a period of time and renewed after a defined period.
Disposable daily lenses are worn all day long and discarded at bedtime, then replaced by a new pair the next morning. The other lenses have different renewal frequencies (weekly, bimonthly, monthly, annual...).
Whatever your lifestyle and preferences, your eye doctor can help you find the right contact lenses or care solutions for you. Always remember to consult a professional if you have questions about the health of your eyes and vision.
The advantages of contact lenses
In terms of visual corrections, contact lenses provide you with a clear peripheral field of vision, the freedom to be active and a new look.
Below are the main reasons why contact lenses offer you a new way of seeing, looking and feeling.
- See clearly : Contact lenses move with your eyes, wherever you look, to provide you with clear peripheral vision. They help you follow the action with precise, peripheral vision, even in low light, without glare. In addition, the lenses do not get wet when it rains or fog up in a warmer place.
- Feeling free : Contact lenses give you freedom of movement adapted to your active lifestyle, as they are lighter and less restrictive than glasses, do not slip off the nose, and do not interfere with helmets or protections.
- Feeling good : Contact lenses can improve the way you see yourself and others see you, naturally. And you can use sunglasses without a prescription.
Almost anyone can wear contact lenses, regardless of age or lifestyle.
The rules and basic knowledge of lenses
- A contact lens is an optical device that, when placed on the surface of the eye, compensates for a visual abnormality.
- Lenses correct the vast majority of visual defects, myopia, hyperopia, astigmatism and presbyopia.
- Lenses require strict hygiene rules
- Any damaged lenses should be discarded immediately.
- Only lenses prescribed for extended wear can be worn day and night, but extended wear significantly increases the risk of infection, which can lead to eye complications.
- Never sleep with daily lenses that do not allow sufficient oxygenation of the eye when the eyelids are closed, except for a nap of a few minutes.
- Once a year, have your ophthalmologist check the condition of your eyes under your lenses.
- When removing them, store your contact lenses in places that are not too ventilated and especially not dusty.
- Smoke is harmful to contact lenses.
- Generally, lenses can be worn for up to 14 hours a day. Beyond this period, the quality and effectiveness of the lenses decreases due to impurity deposits that accumulate between the cornea and the lens. Abnormal eye fatigue may also result.
- In case of irritation, do not rub the lens and do not touch it with your fingers except to remove it.
- All lens handling must be preceded by careful hand washing.
- Do not lend your lenses! These are strictly personal accessories. Any possible infection of the eye can be transmitted through the lenses.
- The frequency of lens replacement is indicated on the prescription. Take this into account carefully.
- Never exceed the shelf life, let alone the expiration date, of the lenses. The first is based on the date the container was opened, while the second, determined by the manufacturer, is indicated on the packaging.
- Corrections for glasses and contact lenses are very often different. Do not use a prescription that does not match your purchase because you may not see correctly. Go to an optician or ophthalmologist who will provide you with a prescription according to your actual needs.
Be aware that the most common complications such as infection and inflammation can lead to vision loss or blindness.