<prompt> Sclera is thinnest :At the limbusUnder inseion of rectiAnterior to attachment of rectusAt the equator  <response>: - Sclera is thinnest posterior to rectus muscle inseions 0.3 mm - Posterior 56th of the outer fibrous coat of eye forms the sclera - It is white opaque in colour due to haphazardous arrangement of collagen in it . - Anterior 16th of the outer fibrous coat is transparent due to regular arrangement of collagen, known as Cornea - Corneo-Scleral Junction - Limbus - Outer surface of sclera is covered by conjunctiva, beneath that is a layer of loose connective tissue called episclera. - Innermost layer of sclera consists of elastic fibres called lamina fusca. - Lining inner aspect of sclera are- highly vascular uveal tract concerned chiefly with nutrition of eye true visual nerve endings concerned with reception transformation of light stimuli, called retina - Deficient pa of sclera is lamina cribrosa which is pierced by axons forming the optic nerve as they traverse from optic nerve head optic disc posteriorly 