In some offices, this process is used to provide the starting point for the ophthalmologist or optometrist in subjective refraction tests. Here, lenses are switched in and out of a phoropter and the patient is asked "which looks better" while looking at a chart. This feedback refines the prescription to one which provides the patient with the best vision. Automated refraction is particularly useful when dealing with non-communicative people such as young children or those with disabilities.
Autorefractor
Autoinjector
Lensmeter
Thalamic stimulator
Pupilometer
Focometer
Oculocardiac reflex
Retrobulbar block