A transient ischemic attack (TIA) occurs when blood flow to a part of the brain stops for a brief time. A person will have stroke-like symptoms for up to 24 hours.
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A misalignment of the two eyes that only appears when binocular viewing is broken and the two eyes are no longer looking at the same object. A tropia is a manifest deviation of the eyes. A phoria is a latent deviation (un-manifested) between the eyes. Phorias can be unmasked by covering either one of the eyes. Tropias are diagnosed by the cover-uncover test (Unilateral cover test). Phorias are diagnosed by the cover-cover test (Alternating cover test). A tropia is always present. Phorias are present some of the time.