Welch Allyn's 18245 Elite Retinosopce is 40% brighter than standard retinoscopes. One of the brightest streak retinoscopes in the industry. It maintains a consistent output level throughout its life. The 18245 provides the sharpest retinal reflex, making refractions easier than ever. Special sealed construction keeps the optics cleaner for more effective exams. Cross-linear polarization eliminates 99% of bothersome glare from trial lenses. Continuously rotating, completely external focusing sleeve improves the scope's comfort and manueuverability, for any sized hand.