Most cataracts develop when aging or injury changes the tissue that makes up the eye’s lens. Proteins and fibers in the lens begin to break down, causing vision to become hazy or cloudy. Some inherited genetic disorders that cause other health problems can increase your risk of cataracts.
The lens is usually transparent, allowing light to pass though to the retina at the back of the eye. Cataracts, however, cause the lens to become opaque and as the cataracts grow in size or number, vision gradually worsens, as less light is able to penetrate the lens.
Presbyopia is caused by a hardening of the lens of your eye, which occurs with aging. As your lens becomes less flexible, it can no longer change shape to focus on close-up images.
What are cataracts? Cataracts are cloudy areas that develop in the lens in the front of the eye. Normally, the lens of the eye is clear like a camera lens. Cataracts keep light from easily passing through the lens to the back of the eye (the retina), causing blurry vision.
As this thickening occurs, it prevents light rays from passing through the lens and focusing on the retina – the light sensitive tissue lining located in the back of the eye. This clouding is caused when some of the protein which makes up the lens begins to clump together and interferes with vision.
The cornea is a transparent structure that covers the iris. Certain metabolic diseases, trauma, infectious diseases, nutritional deficiencies and environmental situations may cause the cornea to be less transparent and cloudy. If the cornea becomes cloudy, it can lead to various degrees of vision loss.
The outer layer of the eyeball is a tough, white, opaque membrane called the sclera (the white of the eye). The slight bulge in the sclera at the front of the eye is a clear, thin, dome-shaped tissue called the cornea.
If your cornea or lens isn’t evenly and smoothly curved, light rays aren’t refracted properly, and you have a refractive error. Farsightedness occurs when your eyeball is shorter than normal or your cornea is curved too little.
A concave lens is a lens that possesses at least one surface that curves inwards. It is a diverging lens, meaning that it spreads out light rays that have been refracted through it. A concave lens is thinner at its centre than at its edges, and is used to correct short-sightedness (myopia).
Farsightedness, or hyperopia, affects 5% to 10% of Americans. People who are farsighted can see objects that are far away but have trouble focusing on close things. You may have blurry vision, get headaches or squint a lot.
The cornea is the transparent part of the eye that covers the front portion of the eye. It covers the pupil (the opening at the center of the eye), iris (the colored part of the eye), and anterior chamber (the fluid-filled inside of the eye).
cataract, a waterfall (q.v.), especially one containing great volumes of water rushing over a precipice.
A cataract exists when the natural crystalline lens of the eye becomes cloudy or opaque over time, leading to blurring and a gradual loss of visual clarity. It is the most common cause of visual impairment and blindness around the world.
Cataract: it is a condition in which the lens turns opaque and the vision is cut down even to total blindness. A cataract is a clouding of the natural lens, which is responsible for focusing light and producing clear, sharp images.
Cloudy vision is the loss of visual acuity or a blurring of visual perception that can affect one or both eyes. You may experience cloudy vision as a haziness or lack of clarity in your eyesight.