Fig. 7. A. Stage 4A ROP. Subtotal retinal detachment does not involve the fovea. B. Stage 4B ROP. Subtotal retinal detachment involves the fovea. C. Stage 5 ROP. Total retinal detachment. The detachment may be shallow, with an open funnel configuration, as in this example. Note the loss of the choroidal vascular pattern because of subretinal fluid.