<prompt> Hyaluronic acid is present inLensVitreous humourBlood vesselscornea  <response>: Vitreous is composed of water, collagen and hyaluronic acid. Vitreous Humour. Vitreous humor is the fluid-like gel, composed of approximately 98-99 water with trace amounts of hyaluronic acid, glucose, anions, cations, ions, and collagen, located in the posterior chambers of the eyes Reference: khurana 6th edition pg 567 