Superior illumination, the right design for accurate refraction. Welch Allyn 3.5v Coaxial Ophthalmoscope:-. User Manual for Streak and Ophthalmoscope. The patented Welch Allyn Coaxial Vision System facilitates ophthalmoscopy by enabling easier entry into the eye, a larger field of view, and reduced glare compared to standard ophthalmoscopes.
eBay