Disorders in which the Margin of the Optic Disk
is Well Defined
Optic Nerve Pits
An optic nerve pit (Fig. 13.17) is characterized by a round or oval grayishdepression in the papillary tissue that does not compromise the margin of the optic disk. These pits are usually found in an inferior temporal location,although they do occur elsewhere. In 85% of all cases, one eye is affected.
Several pits in one optic disk have been
described. Serous retinal detachment occurs in 25% of all cases, depending on
the location of the pit. Where the detachment affects the macula, a significant
loss of visual acuity will result that will prove very difficult to manage with
laser surgery. Otherwise optic nerve pits are an incidental finding without any functional deficit. They are
considered to be rudimentary colobomas.