<prompt> Yakha inguqulo eyinkimbinkimbi yalesi sigwebo Kunezinhlobo ezintathu eziyinhloko ze-expander, zonke eziye zavela kuma-Fresnel prisms.  <response>: Yiqiniso, inguqulo eyinkimbinkimbi yomusho ithi Kunezinhlobo ezintathu eziyinhloko ze-expander, zonke eziye zavela kuma-Fresnel prisms: i-Gottlieb Visual Field Awareness System, i-lens ye-Chadwick hemianopsia, ne-lens ye-EP. 