Natyashastra
विस्फारितोभयपुटा भयकम्पिततारका । निष्क्रान्तमध्या दृष्टिस्तु भयभावे भयान्विता ॥ ६१॥
Bhayānvita: The Glance in which the eyes are widely opened, the eyeballs are mobile in fear and are away from the centre ॥ of the eye॥, is called Bhayānvitā (awestricken); it is used in fear.
english translation
visphAritobhayapuTA bhayakampitatArakA । niSkrAntamadhyA dRSTistu bhayabhAve bhayAnvitA ॥ 61॥
hk transliteration by Sanscript