Williams Eye Speculum is widely used to widen the palpebral fissure. It is also used in enucleation surgery or strabismus surgery, where the extension of the palpebral aperture is desirable. It works on the principle in which lateral canthus may push the eye to increase the intraocular pressure. Thus, an excessive extension of palpebral fissure should be avoided in patients suffering from penetrating injuries.