Lamina cribrosa is absent in -
The nerve fibers forming the optic nerve exit the eye posteriorly through a hole in the sclera that is occupied by a mesh-like structure called the lamina cribrosa. It is formed by a multilayered network of collagen fibers that inse into the scleral canal wall. It is absent in morning glory syndrome. Ref khurana 6/e
Morning glory syndrome
Nanophthalmia
Colobama of retina
Optic nerve agenesis
Miscellaneous