If you are looking for the full Sanskrit text along with translations, you can find several versions on , including: Chakshushopanishad for Eye Health PDF
The Chakshu Upanishad explains the science of vision through a spiritual lens. It describes which element rules the retina and which deity guards the pupil. chakshu upanishad pdf
You can find and download the full text of the Chakshu Upanishad through these resources: If you are looking for the full Sanskrit
If you're looking for a PDF version of the Chakshu Upanishad, here are a few possible sources: you can find several versions on