Nerve Growth Factor (NGF), in the form of a preparation to be administered over ocular surface, is suggested as being suitable for therapy and/or prophylaxis of intraocular tissue pathologies, with particular reference to sclera, ciliary body, crystalline lens, retina, optic nerve, vitreous body and choroidea affections. When administered in the form of external ophthlamic preparation, for example as collyrium or ointment, NGF is capable to go through ocular tissues and it has been found out that it shows a therapeutic activity not only against retina and optic nerve pathologies but also against affections involving the above reported internal structures of the eye.