Natyashastra
निष्क्रामणं संवलनं कर्तव्यं तु भयानके । हास्यबीभत्सयोश्चापि प्रवेशनमिहेष्यते ॥ १०३॥
Niṣkramaṇa (going out), and Valana (turning of the eyeballs)—in the Terrible Sentiment. Saṃpraveśana (drawing of the eyeball)—in the Comic and the Odious Sentiments.
english translation
niSkrAmaNaM saMvalanaM kartavyaM tu bhayAnake । hAsyabIbhatsayozcApi pravezanamiheSyate ॥ 103॥
hk transliteration by Sanscript