That won't compile. You can only use override when the method is virtual in the base class. And once it's virtual in the base class it's virtual in the n-th child too.
The dry type may set the stage for the less common but more severe wet form in which blood vessels and scar tissue begin to grow abnormally beneath the retina, leading to permanent damage of the macula. The macula is located at the center of the retina, the light-sensitive tissue lining the back of the eye. The retina converts light, or images, into nerve impulses that are carried to the brain via the optic nerve. People with AMD may gradually lose their central vision, which can seriously impact their quality of life.
The retina is composed of neural tissue and is located in the back of the eye, between the retinal pigment epithelium (RPE) and the vitreous body. The retina is a highly complex tissue, and is the most accessible part of the central nervous system (CNS) (Yang, 2004).