No statistical difference could be found between the mean central corneal thickness of normal eyes and those with primary angle-closure glaucoma. For normal eyes no correlations could be found for central corneal thickness against axial length, mean radius of corneal curvature, or age. For eyes with primary angle-closure glaucoma, no correlations could be found for central corneal thickness against axial length or mean radius of corneal curvature, but a minute significant central corneal thinning was found with increasing age. The investigations described previously (Lowe, 1969b) and in this paper show the curvature and thickness of the cornea have no special effect in producing the shallow anterior chamber typical of eyes with primary angle-closure glaucoma. Corneal thickness assumes importance only during severe attacks of acute angle-closure glaucoma when the thickened oedematous cornea can encourage iridocorneal contact and peripheral anterior synechiae.