Hola peeps
I think the glasses issue is meant to highlight the difference in how Abir and Kunal treat Mishti.
Abir got her a pair of new glasses after asking Shaurya about it. He is able to anticipate her needs and surprise her in a way that makes her feel special. Abir's gift gives Mishti a choice- the choice to wear a different pair of glasses if she does not like this pair. Abir knows Mishti likes her glasses, so he simply gave her a new pair to replace the broken pair.
In contrast, Kunal assumed Mishti would be okay or even happy with a lasik surgery, without asking her. Unlike Abir, Kunal's gift does not give Mishti any choice; it's a permanent change that he believes is better for her. It's based on what HE likes. Kunal thinks eliminating the glasses will help Mishti but cannot see that Mishti considers the glasses a part of her identity.
Mishti's reaction in the promo shows how she treats the two differently as well. She is a sherni in front of Abir but becomes a bheegi billi in front of Kunal. She has very low expectations from Kunal and if he does anything remotely nice, she gives him an A+. She takes Abir for granted. Though Abir was actually batting for her, she gave him an earful because she doesn't want to spoil things with Kunal (thanks to Badi Maa's pressure).
She is already compromising on her identity, something she swore she would never do. Why scold poor Abir? He has been nothing but extremely caring towards her. 🤷♀️
What say?
