multifunctional optical accessories revolutionized the way people see
If you are not sure of how contact lenses work, then you must first get a basic understanding of the various parts that make up this popular optical accessory. Before anything else, contact lenses are simply thin artificial lenses placed directly onto the cornea of the eye, which is the transparent covering that protects the pupil from vision in any direction. Unlike glasses, contact lenses are ergonomic devices intended to suit the shape and size of the eye, as well as its natural curvature. These , and in turn, improved their vision.
Contact lenses themselves are not a new invention; however, their widespread use came about because of advances in the design and manufacturing of the equipment used to fit them. In the past, contact lenses were simply made out of plastic, with the entire area of the eye covered by a thin membrane called the corneal epithelium. Modern contact lenses, although still made out of plastic, now come in many different materials, including but not limited to polycarbonate and hydro gel. These two different materials allow for greater visual freedom, such as wider eye relief, more neutral toned lenses, higher levels of comfort, and reduced risk of eye infections. However, despite these wonderful changes in the design of modern lenses, one aspect of the cornea needs to be addressed, and that is the citation needed for proper eye care.
Proper use of contact lenses is important
Because contact lenses rest on the cornea, they exert a gentle pulling force on the corneal epithelium, which is the lining that surrounds the eye. Over time, this gentle pressure can lead to thinning of the cornea, which is called cataract. It is at this point, if the cornea has not been adequately prepared to counter the force of the lenses, that it can contract and lose its transparency. This can result in blurry vision, along with other vision impairments that can affect your ability to drive, read, write, watch television, or do just about anything else.
This problem, however, is more common with mono vision contacts, which are lenses that rest directly on the cornea. Mono vision contacts are generally the same lenses that we use for vision straightening, such as those that we wear for our eyesight improvement during exams. These contact lenses are made up of a thin film of plastic that are placed atop the lens material, rather than being composed of a thin layer of plastic like we use for contact lenses. This allows for a higher level of visual clarity with these types of contacts. However, because the contact lenses are not composed of the corneal epithelium, they can also lead to problems if they are not properly cared for.
Like all contact lenses, proper care of them necessitates the wearing of protective eyewear – or, in some cases, even eye drops. In the case of mono vision contact lenses, because there is no epithelial lining the inside of the eye, the lens will be more susceptible to abrasion and other damage when contact is made with the top layer of the cornea. If a proper eye care regimen is not followed, then this can lead to vision impairments such as nearsightedness, farsightedness, astigmatism, and even headaches.
Because the inside of the cornea does not receive any protection from contact lenses, the microkeratome can be scratched by rubbing or even brushing the lens. This process can even damage the epithelial lining, which is what causes the visual distortions.
This leads to what is known as “corneal scarring.” What happens with corneal scarring is the light from the sun, or even artificial light from fluorescent lights, can cause the delicate tissue within the cornea to break down. The collagen-rich tissue is broken down over time. Because the body can no longer produce this collagen, the only defense against the effects of the environment is through a thin layer of cells that lines the inside of the cornea. The cells protect the cornea and the delicate nerve endings, but over time, this thin layer of cells can deteriorate and become detached from the cornea itself. When this occurs, the person wears contact lenses, but they no longer have protection from the UV rays that damage their eyes.