Clark County High School students Deserae Olsen, left, Cristobal Luna, Maryanna Muñoz and Kaelyn Yarbrough, second right, listen as Scott Helkaa, program director for ophthalmic technology at College of Southern Nevada, demonstrates how an optical lens edger is used to make eyeglasses during Health Career Exploration Camp at CSN Las Vegas campus on Wednesday, June 6, 2018. Bizuayehu Tesfaye/Las Vegas Review-Journal @bizutesfaye