Luedde ExophthalmometerDesigned for simplicity and accuracy in measurement of ophthalmos. Base is clear plastic with easy to read millimeter lines on both sides. Eye is seen through lower half of scale and the scale is then viewed through the upper half to eliminate parallax thusaiding in the rapid determination of protrusion. Clinicalpapers show superior results in spite of the simplicityof this device onvce the technique is learned. The Luedde is indexed using the outer