Natyashastra
सहसा दर्शनं यत् स्यात्तदालोकितमुच्यते । विलोकितं पृष्टतस्तु पार्श्वाभ्यां तु प्रलोकितम् ॥ १०९॥
Ālokita (casual)—(the eyeballs) in suddenly seeing any object. Vilokita (looking round)—(eyeballs) in looking back. Pralokita (carefully looking)—turning (eyeballs) from side to side.
english translation
sahasA darzanaM yat syAttadAlokitamucyate । vilokitaM pRSTatastu pArzvAbhyAM tu pralokitam ॥ 109॥
hk transliteration by Sanscript