A polygonal number is a type of figurate number that is a generalization of triangular, square, etc., to an-gon for an arbitrary positive integer. The above diagrams graphically illustrate the process by which the polygonal numbers are built up. Starting with the th triangular number, then.
PURPOSE: Divergence insufficiency is an unusual form of strabismus with esotropia and diplopia only at distance and single binocular vision at near.This retrospective case series describes the diagnosis and treatment of 7 patients and differentiates this clinical entity from other conditions.ONCLUSIONS: Divergence insufficiency is a distinct clinical entity in otherwise healthy patients, which can be successfully treated by unilateral or bilateral medial rectus recession. [PubMed-indexed for MEDLINE].
vertebrobasilar insufficiency (verËÂ·t Â·brÅÂ·bÄËÂ·z Â·ler inËÂ·s Â·fiËÂ·sh nÂ·sÄ) , n a disorder caused by decrease of blood flow in the vertebral or basilar arteries due to atherosclerosis or compression placed on the external wall of the arteries. Symptoms may include loss of vision, dizziness, or nausea.