I was watching Main Vaapas Aaunga recently and there is a scene where Naseeruddin Shah remembers the poem he had written and suddenly looks at his pillow to tuck out the poem. In that moment his eyes spoke so much. And I realised how Naseeruddin Shah has used his eyes in acting so effectively throughout.
Watch his film Sparsh where he played a visually challenged person without wearing any dark glasses so you can see how well he uses his eye movement to express emotions while being so convincing as a visually impaired person.
See his wife range of emotions in art films like Manthan, Mandi, Aakrosh, Paar and even his commercial films like Sarfarosh. His eyes express a thousand emotions and makes him one of the greatest actors of Indian cinema.