Indirectly. Because polycythemia Vera results in too many red blood cells being formed, blood flow may stagnate leading to vascular obstructions. If this occurs in the eye, as in a central retinal vein occlusion, the resulting consequence can lead to secondary glaucoma, which is often very difficult to manage. .
It shouldn't. Glaucoma is an increase in the intraocular pressure with other effects on the eye. In polycythemia there are too many blood cells and blood clots and/or bleeding can result in the eyes especially in the retina. In this way the polycythemia can affect the intraocular pressure but without clotting/bleeding should not affect the glaucoma primarily. You need to be followed by an ophthalmologist.