From Valve Developer Community
This article is about the obsolete shader. For the succeeding shader, see
EyeRefract. For the QC property of $model, see Eyeball. For the tool, see qc_eyes.
This shader is obsolete; its use is discouraged and it may only exist/function in older engine branches.
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Note:This shader was obsoleted by the
EyeRefractshader; use that instead.