Investigation of peripheral retina refractive error measurement methods... METHODS: Streak retinoscopy, Shin-Nippon K5001 Auto-refractor and Aberrometor(COAS)were used to measure 28 participants' central and peripheral retinal field refractive errors....
Noncontacting method for measuring angular deflection... Light from a light source is transmitted through a flat refractor to a converging lens which focuses the light through another flat refractor onto a differential photocell....
Relative astrometric and photometric measurements of visual binaries made with the nice 76-cm refractor in 2008interferometry, lucky imaging, direct vector auto-correlation — instruments: 76-cm refractor We present relative astrometric and photometric measurements of visual binaries made in 2008, with the 76cm refractor of Côte d’Azur Observatory....
Light beams refractor... In this note, our goal is to find a refractor lens that refracts all prescribed light rays, in different directions, to the origin....