Quelles lentilles d'examen et comment les utiliser correctement ?

The vitreous is examined with the slit lamp, either alone for observation of the anterior third of the vitreous body or by placement of a lens between the slit lamp and the patient's eye for observation of the rest. Several types of lens are available, both convex and concave, with or without contact, allowing for observation of the different parts of the vitreous and retina. Rules concerning positioning of the slit lamp, the lens, and the patient must be followed to obtain the maximum amount of information.