Contact lenses are lenses worn by people with visual impairments or those who wish to have colored eyes. It is a different option to gain the right perspective without the need for glasses or surgical operation. In addition, contact lenses are preferred in corneal diseases, prosthetic (lenses used for aesthetic purposes after damage or damage to the eye) contact lenses.
By eliminating the refraction of the light formed by the lens, that is, the refractive error, it improves the quality of life of people with visual impairment and enables them to see much more clearly and properly. contact lenses clear or color lens There are many different types, including An eye examination is required by an ophthalmologist in order to choose contact lenses suitable for the eye structure, and as a result, the numbered lenses should be taken in accordance with your eye degree given by your doctor.
For What Purposes Are Contact Lenses Used?
Although contact lenses are used for temporary correction of eye defects, they are also used during the treatment process or for cosmetic purposes after some operations.
Contact Lens Types
Today, there are many types of the most commonly used contact lenses, respectively; It is divided into types as soft, hard and semi-hard.
Soft Lenses
Soft (hydrogel) lenses, which have a very thin structure and are generally preferred as transparent, also have water retention. These lenses, which completely cover the cornea; It can also be used by patients diagnosed with myopia, hyperopia, astigmatism and presbyopia (also called the regression of the adaptability and focusing ability of the lens in the eye, that is, the loss of sufficient flexibility of the lens in the eye) diagnosed by the doctor. It also provides temporary treatment of these refractive errors during the period of wearing the lenses.
Hard Lenses
Hard lenses provide a high level of oxygen transfer to the eye in daily use. It can also be called a gas permeable lens due to its ability to transmit oxygen. Although this type of lens, which has a very durable structure, is used for all refractive errors, it is also preferred by the majority of individuals with astigmatism. The main reason why it is preferred is that hard lenses do not fit the cornea properly. Another area of use for hard lenses is keratoconus (patients have difficulty seeing far and near as a result of myopia and irregular astigmatism). In the treatment process of visual defect, patients are generally recommended to use hard lenses.
Contact Lens as a Type of Prosthesis
Contact lenses, classified as a type of prosthesis, consist of a posterior and anterior surface. Depending on the type of lens, different standard tilt angles and diameter length options are also available. The standard dimensions of these options are diameter (DIA) 14.20mm, and the basic curve (BC) ratio is 8.60mm.
The point at the junction of the lens and cornea is the posterior surface. The non-contact front surface has a bevel that corrects refractive errors and ensures correct refraction of light. In order for contact lenses not to sting and to be used comfortably, the slopes of the front and back surfaces must be the same.
In this sense, it is very important that the base curve, also known as the posterior surface radius, is compatible with the cornea. The diameter value, which shows the compatibility of the lens with the eye, is the measurement between the outer edges. In order for contact lenses not to cause stinging and to be used comfortably, the front and back surface slopes should be equal to each other. It is very important that the basic curvature, known as the radius of the posterior surface, is compatible with the cornea. The diameter value, which shows the harmony of the lens with the eye, expresses the measure between the outer edges.
Therapeutic Use of Visual Defects
Contact lenses are mostly used for the treatment of refractive or vision problems. This application area can be considered as an alternative to eyeglass and laser surgery procedures. Eye defects such as myopia (farsightedness), hyperopia (nearsightedness), astigmatism (inability to see clearly) and presbyopia (sensory shortsightedness) can be corrected with contact lenses.
Contact lenses are also used as part of the healing process after some eye operations. It can be said that after the operation, contact lenses shorten the healing process and minimize the pain and pain experienced by the patient after the operation.
Contact lenses are also used to cover the eye. The use of contact lenses is very useful in severe cases such as corneal ulcer (painful eye redness and reduced vision with mild eye discharge symptoms), scratches on the cornea, detachment of the epithelial layer. In these cases, the lens has become an option for the eye that is normally covered with a bandage. This function of the contact lens eliminates the loss of visual function that occurs when the operation area is covered with a normal bandage, and the area is covered with the help of the lens.
Cosmetic Use
Contact lenses can be used for cosmetic purposes in two ways. First of all, people who do not have eye health problems may prefer contact lenses for purely cosmetic purposes. (Example: Labella Lens) Lenses different from eye color can also be used just to change the eye color or the external appearance of the eye. Additionally, contact lenses can be used to camouflage incurable eye problems. Prosthetic use, that is, the situation of use after damage or damage to the eye.
Even though people have problems with vision in cases where the eye surface is irreversibly destroyed or the iris layer is absent, contact lenses have made this situation hideable in appearance.
Is There Any Harm To Use Contact Lenses?
The use of contact lenses can cause various complications due to non-compliance with the hygiene rules, and as a result, doctors recommend that the use of contact lenses be stopped for a while and the use of glasses should be started immediately during the period of symptoms.
Eye diseases
Eye diseases appear as defects or diseases that occur due to genetic causes, infection, environmental factors or aging.
Myopic
In myopia, the shape of the eyeball causes rays to be refracted incorrectly, causing images to be focused in front of the retina instead of the retina. People with this eye defect see near objects clearly, but distant objects are blurred, and it is a common vision defect today.
Hypermetropic
Hyperopia is an eye defect that occurs as a result of focusing the rays coming into the eye behind the retina (the retina). While hypermetropes have no problem seeing far away, they cannot see near objects clearly. Hyperopia is not considered a disease because it is defined as a refractive error.
astigmatism
Astigmatism is a vision problem caused by the structure of the cornea or the lens of the eye, resulting in incongruous curvature.
Astigmatism is defined as a refractive error like myopia and hyperopia. As with other refractive errors, the light cannot focus on the point where it should be focused on the retina, and depending on the type of astigmatism, it may cause the problem of focusing in front of or behind the retina. Thus, people with astigmatism cannot see near or far according to the region where the light is refracted to the retina.
Presbyopia
Presbyopia is a near vision disorder that occurs as a result of the regression of the adaptability and focusing ability of the lens of the eye, that is, the loss of flexibility of the lens in the eye, which may increase to a certain extent as age progresses.
Keratoconus
Keratoconus is the name given to the thinning and anterior bulging of the cornea, which is the transparent layer of the eye, located in the front of the eye.
Thanks to this article, you can now more clearly choose the appropriate lens for yourself on our site lensfiyat.com. It will be helpful to read our other blog posts to answer your other questions about contact lenses and colored lenses.