Are there any herbal/homeopathic remedies for eye strain and the accompanying headaches?

No. Our eyes are designed to see things in 3d. When you look at a computer/book etc for a long time (a 2d surface) you can strain your eyes or get dry eyes. Every 20 minutes rest your eyes for 20 seconds by looking at something at least 20 feet away.
SOD. Eye needs superoxide dismutase, zeaxanthine, lutein. For any eye stress take high sod -5000 units available from biotics called dismuzyme plus. Zeaxanthine is available in high dose as ocuven from qnlabs.
Unfortunately no. Herbal and homeopathic remedies can be helpful adjuncts to other therapeutic regimens. In the case of eye strain, the cause is usually either dry eyes - which can be treated with lubricating eye drops; or a need for glasses. Your best bet would be to start with a visit to your eye doctor to evaluate the cause of your eye strain.