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The country with the highest reported prevalence among the compilation of systematic reviews is China at 62%. [33] The prevalence of astigmatism increases with age due to changes in refractive index gradients. [33] [34] According to an American study, nearly three in ten children (28.4%) between the ages of five and seventeen have astigmatism. [35]
The symptoms and signs associated with convergence insufficiency are related to prolonged, visually demanding, near-centered tasks. They may include, but are not limited to, diplopia (double vision), asthenopia (eye strain), transient blurred vision, difficulty sustaining near-visual function, abnormal fatigue, headache, and abnormal postural adaptation, among others.
Tyramine is an amino acid found in some foods and can be part of a chain reaction that leads blood vessels in the head to narrow and dilate, which causes throbbing pain, according to the National ...
Headache, also known as cephalalgia, is the symptom of pain in the face, head, or neck. It can occur as a migraine, tension-type headache, or cluster headache. [ 1][ 2] There is an increased risk of depression in those with severe headaches. [ 3] Headaches can occur as a result of many conditions. There are a number of different classification ...
Amblyopia. Anisometropia is a condition in which a person's eyes have substantially differing refractive power. [ 1] Generally, a difference in power of one diopter (1D) is the threshold for diagnosis of the condition. [ 2][ 3] Patients may have up to 3D of anisometropia before the condition becomes clinically significant due to headache, eye ...
Hyperparathyroidism is an increase in parathyroid hormone (PTH) levels in the blood. [ 1][ 4] This occurs from a disorder either within the parathyroid glands ( primary hyperparathyroidism) or as response to external stimuli ( secondary hyperparathyroidism ). [ 1] Symptoms of hyperparathyroidism are caused by inappropriately normal or elevated ...
The nutrients in these healthy foods and drinks can help you manage painful headaches.
Subarachnoid hemorrhage may also occur in people who have had a head injury. Symptoms may include headache, decreased level of consciousness and hemiparesis (weakness of one side of the body). SAH is a frequent occurrence in traumatic brain injury and carries a poor prognosis if it is associated with deterioration in the level of consciousness.