Eyepiece guard for stereo microscopes that reduces eye strain and protects your eyes from external light Made from soft rubber that will not damage or scratch the microscope eyepiece Enhances clarity by shielding the eye from stray light, helping you see details more clearly Three size options to fit common eyepiece diameters and lens sizes 33 mm diameter, 18 mm height; suitable for 32 35 mm lenses 36 mm diameter, 18 mm height; suitable for 34 37 mm lenses 33 mm diameter, 30.7 mm height; suitable for 32 35 mm lenses Material: soft rubber for comfortable, non abrasive contact with eyepieces Function and compatibility clearly defined by size variants to match standard 32 35 mm and 34 37 mm lens assemblies Use scenarios: Long observation sessions to reduce eye fatigue during routine specimen examination Educational settings or workshops where multiple users share a stereo microscope Bright illumination environments where reducing glare improves contrast and detail visibility