Skiascope is a device used in ophthalmology to examine and measure the refraction of the eye. It operates by projecting a beam of light into the eye and analyzing the way it is reflected back. Some synonyms for skiascope that can be used in scientific literature include retinoscope, optometer, and ophthalmoscope. These terms are all used to describe instruments that are used to evaluate the eye's refractive error. While skiascope is a more traditional term, using synonyms like retinoscope and ophthalmoscope can help to provide clarity in written works, enabling readers to better understand the methods used to examine and diagnose eye problems.