A Macular Hole is a small break in the central part of the retina, known as the macula, which is responsible for your central, detailed vision. It is caused by the vitreous gel, which fills the eye, contracting and pulling away from the retina. As it pulls away, the gel can remain attached at the macula, leading to enough pulling to cause a break in the macular tissue. Macular Holes can be observed if clarity of vision is preserved, or repaired surgically if vision is significantly affected.
OCT image of a Macular Hole associated with Macular Pucker