High-resolution optical coherence tomography for screening ocular surface tumors: Historical markers and future directions

Table 2 Gross histology of the external ocular tunic

Histologic landmarks	Structural anatomy	Clinical anatomy
Episclera	Loose fibroelastic tissue layer overlying Tenon's capsule	Vascularized portion of sclera
Tenon’s capsule	Smooth muscle fiber and collagenous fascia	Transition zone from episclera to sclera
Stroma	Interlacing network of type 1 collagen and elastic fibers, oriented without parallelism.	Dense portion of sclera
Suprachoroidal lamina	Contains fibroblasts and melanocytes	Thin fibrous connective tissue between sclera and choroid
Scleral endothelium	Simple squamous epithelium	Covers deep suprachoroidal lamina at the limbus
Limbus	Scleral-corneal junction. Transition of scleral to corneal collagen bundles	Area of contact between conjunctival stroma and Tenon's capsule. Limbal stem cells (unipotent to superficial corneal layers) at palisades of Vogt