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INFO: Full form for AVC is Academy of Veterinary Consultants in Medical category
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INFO: Full form for NLP is Neuro-Linguistisches Programmieren in Medical category
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Visual impairment, also known as vision impairment or vision loss, is a decreased ability to see to a degree that causes problems not fixable by usual means, such as glasses. Some also include those who have a decreased ability to see because they do not have access to glasses or contact lenses. Visual impairment is often defined as a best corrected visual acuity of worse than either 20/40 or 20/60. The term blindness is used for complete or nearly complete vision loss. Visual impairment may cause difficulties with normal daily activities such as reading and walking without adaptive training and equipment.

The most common causes of visual impairment globally are uncorrected refractive errors (43%), cataracts (33%), and glaucoma (2%). Refractive errors include near-sightedness, far-sightedness, presbyopia, and astigmatism. Cataracts are the most common cause of blindness. Other disorders that may cause visual problems include age-related macular degeneration, diabetic retinopathy, corneal clouding, childhood blindness, and a number of infections. Visual impairment can also be caused by problems in the brain due to stroke, premature birth, or trauma, among others. These cases are known as cortical visual impairment. Screening for vision problems in children may improve future vision and educational achievement. Screening adults without symptoms is of uncertain benefit. Diagnosis is by an eye exam.

The World Health Organization (WHO) estimates that 80% of visual impairment is either preventable or curable with treatment. This includes cataracts, the infections river blindness and trachoma, glaucoma, diabetic retinopathy, uncorrected refractive errors, and some cases of childhood blindness. Many people with significant visual impairment benefit from vision rehabilitation, changes in their environment, and assistive devices.

As of 2015 there were 940 million people with some degree of vision loss. 246 million had low vision and 39 million were blind. The majority of people with poor vision are in the developing world and are over the age of 50 years. Rates of visual impairment have decreased since the 1990s. Visual impairments have considerable economic costs both directly due to the cost of treatment and indirectly due to decreased ability to work.

INFO: Full form for NLP is Normal Light Perception in Medical category
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INFO: Full form for NTP is Normal Temperature and Pulse in Medical category
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INFO: Full form for NTP is Nutritional Therapy Practitioner in Medical category
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INFO: Full form for NTP is Nutritional Therapy Practicioner in Medical category
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INFO: Full form for NAS is Narcissistic Abuse Syndrome in Medical category
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Neonatal withdrawal or neonatal abstinence syndrome (NAS) or neonatal opioid withdrawal syndrome (NOWS) is a withdrawal syndrome of infants after birth caused by in utero exposure to drugs of dependence, most commonly opioids. Common signs and symptoms include tremors, irritability, vomiting, diarrhea, and fever. NAS is primarily diagnosed with a detailed medication history and scoring systems. First-line treatment should begin with non-medication interventions to support neonate growth, though medication interventions may be used in certain situations.

In 2017, approximately 7.3 per 1,000 hospitalized infants in the United States were diagnosed with NOWS. Now all opioid-exposed infants will show clinical signs of withdrawal after birth. Clinical signs range from mild to severe, depending on the quantity and type of substance exposure.

The most common form on neonatal withdrawal occurs after in utero exposure, however, iatrogenic withdrawal can also occur after medications are used to treat critically ill infants after they are born.

INFO: Full form for NAS is Narcotics Assistance Section in Medical category
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INFO: Full form for NAS is National Acceptor Survey in Medical category
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INFO: Full form for NAS is No Abnormality Seen in Medical category
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INFO: Full form for NAS is Nucleus Accumbens Septum in Medical category
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The Normative Aging Study (NAS) is a longitudinal study which studies the effects of aging on various health issues. The ongoing study was established in 1963 by the United States Department of Veterans Affairs. The initial sample was 2,280 men now with an average age of 72 years (mean age at entry was 42 years). Most participants are veterans from World War II and the Korean War.

Participants in the study have undergone medical examinations every three to five years, also answering questions about behaviors affecting health.

Among the topics researchers have used the NAS for are stress, smoking, and cardiac health.

One of the findings based on the study was that subjective stress appeared to be a better prediction of mortality than the objective evaluation of stressful events.

INFO: Full form for MTA is Mineral Tri-oxide Aggragate in Medical category
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INFO: Full form for MTA is Multimodal Treatment of Attention Deficit Hyperactivity Disorder in Medical category
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INFO: Full form for MTA is Medical Treatment after Accident in Medical category
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INFO: Full form for MTA is Medical Terminology Anatomy in Medical category
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