Pterygium Grading Classification Grade 0 - There is no pterygium tissue present Grade 1 (trace)- Pterygium tissue is translucent, similar to conjunctiva. Episcleral vessels under the body of the pterygium are easily visible. Minimally dilated vessels with slightly increased Grade 2 (mild) - Pterygium tissue is pink. Episcleral vessels under the body of the pterygium are distinguishable. Dilated vessels with increased density Grade 3 (moderate) - Pterygium tissue is red. Episcleral vessels under the body of the pterygium are not distinguishable. Significant tortuous and engorged vessels with minimal Grade 4 (severe) - Pterygium tissue is deep bright diffuse red, very thick. Episcleral vessels and tissues under the body of the pterygium are totally obscured. Dense network of engorged vessels #Pterygium #Grading #Classification #grades #diagnosis #clinical #ophthalmology
