We have many authentic Hadeeths stating that reading Quran from the Quran text or looking at the Quranic text improves the eyesight as well as causes forgiveness for you and your parents.

Reciting Ayatul Kursi while putting your hands on your eyes is also useful for eyesight.

There are many Du'as in this regard like this Du'a which is recommended after Morning and Maghrib Prayers:

ALLAHUMMA INNEE AS'ALUKA BIHAQQI MOHAMMADIN WA AALI MOHAMMADIN A'LAYK AN TOSSALLIYA ALA MOHAMMADIN WA AALI MOHAMMAD WA AN TAJ'ALANNOORA FI BASSARI, WAL BASSERATA FI DEENI, WAL YAQEENA FI QALBI , WASSALAMATA FI NAFSI, WASSA'ATA FI RIZQI, WASHSHUKRA LAKA ABADAN MAA ABQAYTANI)

أللهم إني أسألك بحق محمد وآل محمد عليك أن تصلي على محمد وآل محمد وأن تجعل النور في بصري والبصيرة في ديني واليقين في قلبي والسلامة في نفسي والسعة في رزقي والشكر لك أبدا ما أبقيتني)

Wassalam.