What is Contact Lens?
In order to correct the refractive errors of the eye, the lenses attached to the front surface of the cornea, which is produced as an alternative to the glasses, are called contact lenses. Among the people is called “Lens”. It is used for optic purposes to correct visual defects by attaching to the corneal anterior surface. Contact lenses are used for optic purposes, but are also used for cosmetic and therapeutic purposes. Contact lenses are lenses placed on the surface of the cornea and used to treat defects in the eye or to treat some diseases. The principles of refraction and optics are also applied to contact lenses in a similar way to the glasses. They correct the existing defect by replacing the corneal curvature with a contact lens surface according to the degree of myopia and hypermetropia.
Advantages of Contact Lenses
Contact lenses have the advantages of cosmetics for some people and the convenience of wearing glasses as well as optical advantages. In high grade defects, contact lenses are small in diameter and in thickness, as well as reducing the visual disturbances in the peripheral part due to the fact that they are rectified by the eye directly. It is difficult for the patient to use because the lenses given to those who have lost their lenses for an operation or injury such as surgery or injury in one eye are over-magnified.
The magnification factor in contact lenses is very low and can be tolerated by the patient. Thus, the patient becomes able to use both eyes. In both eyes, non-lenses provide better peripheral vision and image distortion is not much. Patients with keratoconus or other irregular corneas that have little or no improvement in their eyeglasses and who have irregular corneal vision often achieve good vision with contact lenses. Contact lenses also have advantages for athletes and people with special job requirements.
Disadvantages of Contact Lenses
New beginners will have a certain adaptation time. This time is less for those who use soft lens, and longer for those who use hard lens. Care should be taken when cleaning contact lenses. Some eye health problems that may be described later may occur in contact lens wearers.
Sometimes there are times when the lens cannot be used and it may be necessary to wear glasses at these times. Evaluation of visual acuity before using contact lenses Detection of eye number Assessment of eye examination and tear with a biomicroscope, Keratometry Corneal topography, ie corneal topography, if necessary. It is also decided how to use a contact lens.
1. Soft Lenses:
Today, they are the most commonly used lenses. They are preferred due to their ease of use and high oxygen permeability. They are used annually and used daily. Soft lenses are used in high astigmatism of toroidal and advanced ages, and bifocal types are available to see both near and far. Colored lenses for cosmetic purposes are also in the soft lens group.
2. Hard Lenses:
Gas permeable hard lenses are still used successfully. It is a little more difficult to use than soft lenses. High astigmatism and keratoconus are especially preferred in diseases such as. Other advantages of soft lenses are the lesser allergy development and longer duration of use. (2-3 years)
3. Bandage Contact Lenses:
Special lenses are used only in some eye diseases.
HOW TO USE
Always wash your hands before touching your lenses. This will prevent the contamination of your lenses, thus preventing your eyes from germinating. Regular washing of hands also protects your eyes from possible infections. When washing your hands, use a soap that does not contain oil, lotion or perfume, and dry it with a lint-free towel.
Checking the Lens
Contact lenses are provided in sterile closed blister packs or glass vials. Make sure that the packaging package or foil of your lens is not opened and the usage date has not expired. The number of the lens is on the packaging. For both eyes, those who use lenses at different numbers should be sure whether they are opening the appropriate packaging. To prevent lenses from mixing, always wear the same case. Sometimes you may find it difficult to get the lens through the packaging. Never use tweezers or similar tools. When you shake the packaging a few times, you can get your lens easily. To check the lens, place it at the tip of your index finger and point it toward a light source. The lens must be clean and damp. No scratches, nicks, tears or cracks, and small particles should not be stuck