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This means that the refractive power of the eye matches what is needed to focus parallel rays of light onto the retina. A distant object is defined as an object located beyond 6 meters (20 feet) from the eye. When an object is located close to the eye, the rays of light from this object no longer approach the eye parallel to each other.
Glaucoma is a group of eye diseases that lead to damage of the optic nerve, which transmits visual information from the eye to the brain. Glaucoma may cause vision loss if left untreated. It has been called the "silent thief of sight" because the loss of vision usually occurs slowly over a long period of time. [ 5]
This may result in trouble driving, reading, or recognizing faces. [8] Poor vision caused by cataracts may also result in an increased risk of falling and depression. [2] Cataracts cause 51% of all cases of blindness and 33% of visual impairment worldwide. [3] [9]
Retinopathy is any damage to the retina of the eyes, which may cause vision impairment. [ 1] Retinopathy often refers to retinal vascular disease, or damage to the retina caused by abnormal blood flow. [ 2] Age-related macular degeneration is technically included under the umbrella term retinopathy but is often discussed as a separate entity ...
Visual impairment. Visual or vision impairment ( VI or VIP) is the partial or total inability of visual perception. In the absence of treatment such as corrective eyewear, assistive devices, and medical treatment, visual impairment may cause the individual difficulties with normal daily tasks, including reading and walking. [ 6]
Transmission-based precautions are infection-control precautions in health care, in addition to the so-called "standard precautions". They are the latest routine infection prevention and control practices applied for patients who are known or suspected to be infected or colonized with infectious agents, including certain epidemiologically important pathogens, which require additional control ...
Acanthamoeba keratitis ( AK) is a rare disease in which amoebae of the genus Acanthamoeba invade the clear portion of the front ( cornea) of the eye. It affects roughly 100 people in the United States each year. [ 2] Acanthamoeba are protozoa found nearly ubiquitously in soil and water and can cause infections of the skin, eyes, and central ...
Intraocular pressure ( IOP) is the fluid pressure inside the eye. Tonometry is the method eye care professionals use to determine this. IOP is an important aspect in the evaluation of patients at risk of glaucoma. [ 1] Most tonometers are calibrated to measure pressure in millimeters of mercury ( mmHg ).