What are correction lenses?

Correct lenses are glass or plastic lenses worn, on or in the eye that help focus vision. The three main types are glasses, contact lenses and intraocular lenses. Eye care expert can determine the need for corrective lenses and provide a prescription.

Glasses

glasses consist of a frame with lenses resting on the nose and ears. Types include:

• monofocal glasses - for vision of a close or distant.

• bifocal glasses - for close and distant vision, often with a visible dividing line.

• trifocal glasses - for close, medium and far vision.

• progressive lenses - multifocal without visible lines.

• Adjustable lenses - focus can be changed by the wearer.

• aspherical lenses - thinner and aesthetically pleasing.

• Plano lenses - no remedial energy used for fashion or specific medical needs.

lenses can be bright or tinted, some of which pass into sunglasses in sunglasses. Glasses should be cleaned regularly and stored in a protective case. Most glasses require a prescription, even if glasses are available without a prescription.

Contact lenses

Contact lenses are small, round lenses located directly on the eye. They are usually made of plastic or silicone and can be colored for easy handling or cosmetic purposes. Types include:

• disposable contacts -Hened one wear.

• daily wear contacts - removed and cleaned at night.

• contacts of extended wear - wears several days.

• Continual Continualswear - designed for long -term use.

Correct cleaning and storage is necessary to prevent eye infections or complications. In the US, all prescription contacts require.

intraocular lenses

Intraocular lenses (IOL) are implanted in the eye, often replacing the damaged lens due to cataract or other conditions. Most IOL is monofocal and focuses primarily on distance vision, but there are multifocal options. The procedure for the IOL implant is fast, with a recovery time of about 2-3 weeks. Once implanted, they require no maintenance.

How do real lenses work

Correctional lenses Adjust the outbreak of incoming light to ensure that it can hit the retina properly.

• nearsightedness (close) - light will focus in front of the retina; Concave lenses move the focus back.

• hypersopia (Farsiittedness) - Light focuses behindretina; Convex lenses move the focal point forward.

• astigmatism - irregular shape of the cornea; Torical lenses of the correct refraction of lightter lights.

The power of the lens is measured in diopts, with negative values ​​for myopia and positive for hyperopia. Most of the regulations are written in Quarter-Diopter increments.

advantages and disadvantages of corrective lenses

remedial lenses increase vision and improve the quality of life. There is some debate on whether the early use of the lens can lead to addiction, even if it is not convincingly proven. Wearing incorrect regulations can cause eye tension, headaches and dizziness. Properly prescribed lenses are generally safe and beneficial for everyday activities such as management, reading and work.