Laser iridotomy reduces the risk of developing an attack of acute angle closure. The process starts by bending the edge to an acute angle. Acute angle closure is an emergency. Any time traffic flows meet at an acute angle, someone cannot see traffic approaching them. A cement block remained between two brick walls, converging at an acute angle. This is because an acute angle cannot be covered by a finite number of rectangles. There is an acute angle between the scapula and coracoid, as in all flying birds. Mebeverine can, on highly rare occasions, cause drug-induced acute angle closure glaucoma.