Also called indirect lateral illumination-it is possible by concentrating the beam upon the spot at the side of the object it is proposed to examine
Projecting the light upon sclera near the limbus,it is easy to examine the limbal portion of cornea,and if the incident ray is sufficient to induce total internal reflection,the whole of cornea including the opposite limbus ,is lit up.
Produced by a very narrow slit beam focused obliquely.
It resemble a knife like histological section of tissue focused.
Corneal section uses
changes in corneal curvature.
change in corneal thickness.
depth of corneal pathologies; foreign body localization.
OPTICAL SECTION Corneal optic section showing; Tear layer-anterior most bright zone Epithelial layer-dark line immediately behind it. Bowmen’s membrane-a bright line. Stroma-wider granular and greyer zone. Descemets membrane and endothelial layers-posterior most bright zone.