Retinoscope is an ophthalmic diagnostic instrument used to objectively assess a patient’s refractive error by observing the reflection of light from the retina. It helps eye-care professionals determine the appropriate prescription for corrective lenses, particularly when subjective responses from the patient may be difficult to obtain. Designed for clear illumination and accurate observation, retinoscopes are widely used in optometry and ophthalmology clinics for routine eye examinations and pediatric vision assessments.