The Drishtibhedas, as described in the Abhinaya Darpana are 8 in number.
These Drishtibhedas, or gestures of the eyes are used primarily communicate meaning gesturally, and also used for specificity in Nritta.
Please refer to the Shloka below for pronunciation. Please note that the separate movements of the head when put together in a Shloka form 'Sandhis', or compound words in the Sanskrit language. Words like 'ca', 'thatha', mean "and", "also". The separate words for each movement are also given below the shloka.
Samamālokitam Sāci Pralokitanimīlita
Ullokitaānuvrtte ća tatha ćaiva Avalokitam
Ityashtow drishtibedhaha Syuhu Kirtitaha Purvasuribhihi