High intakes of vitamin B6 from food sources have not been reported to cause adverse effects [1]. However, chronic administration of 1â6 g oral pyridoxine per day for 12â40 months can cause severe and progressive sensory neuropathy characterized by ataxia (loss of control of bodily movements) [7,29-32].
Accommodative insufficiency (AI) is a condition in which people find it difficult to focus on near objects, to an extent which is unusually poor for their age group.The condition can occur in young people and children, and it is not caused by a problem with the lens of the eye.his means that accommodative insufficiency is different from the disorder known as presbyopia, commonly seen in people over the age of 40. In presbyopia, the lens loses its elasticity and its ability to adapt for near focusing.
URL of this page: //medlineplus.gov/ency/article/000203.htm. Venous insufficiency is a condition in which the veins have problems sending blood from the legs back to the heart. Normally, valves in your deeper leg veins keep blood moving forward toward the heart. With chronic venous insufficiency, vein walls are weakened and valves are damaged. This causes the veins to stay filled with blood, especially when you are standing. Chronic venous insufficiency is a long-term condition. It is most commonly due to malfunctioning (incompetent) valves in the veins. It may also occur as the result of a past blood clot in the legs.