Bob Smith, an orientation and mobility and home mechanics and creative arts instructor at the South Dakota Rehabilitation Center for the Blind, laughs while talking to, Trenton Rowland, 28, of Sheridan, Wyo., a student at the center who has retinitis pigmentosa--a degenerative eye disease that causes severe vision impairment and often blindness--while working on a table in the wood shop on Thursday, April 10, 2014, at the South Dakota Rehabilitation Center for the Blind in Sioux Falls. (Joe Ahlquist / Argus Leader)