<prompt> Which of the pa of the sclera is thinnest?LimbusEquatorAnterior to attachment of superior rectusPosterior to attachment of superior rectus  <response>: The sclera averages 0.5 mm in thickness, is relatively avascular, and consists of tough, dense connective tissue containing flat type I collagen bundles which intersect in various directions. Sclera is thinner in children than the adults and in females than the males. Sclera is thickest posteriorly 1 mm and gradually becomes thin when traced anteriorly. It is thinnest at the inseion of extraocular muscles 0.3 mm, especially just posterior to the rectus inseions; elsewhere it is about 0.6 mm thick. Ref: Ophthalmology: Expe Consult edited by Myron. Yanoff, Jay S. Duker, James J. Augsburger, 2009, Page 1301. 