Inversions are likely to bring more flow of blood into the eyes but beware of headstands – do these only when entirely healthy.
Through the practice of Shirshasana, the subtle nadis of the head – that is, those related to the brain and sense orgains, such as the eyes – are purified by an inflow of warm blood, and the power of memory is increased. Eye disease is destroyed, the eyes glow, and long-sightedness improves. The five sense organs, too, become purified. (source).
I believe that a mild inversion will provide a decent level of benefits.
Baba Ramdev claims pranayama can help.
In addition: http://bricabrackorner.com/Yoga%20Chapter%2013.htm
GAZE AT A FLAME
Variation 1. The first one involves sitting down, either on the floor or on a chair but in either case with the spine straight, and gazing at the lighted flame of a candle. The candlestick should be placed on a table so that the flame should be level with your eyes and three to four feet away.
Gaze at the flame while you count to sixty and try very hard not to blink during that time. After the count, close your eyes and try to hold the flame in your mind’s eye for a few moments. Open your eyes once more, gaze at the flame, and count to sixty. Close them again and relax.
You may continue the gazing exercise for five minutes, but gradually extend the time ad lib until you can do it for ten minutes without undue strain. All eye exercises should be done very gently and, if any discomfort is felt, they should be stopped immediately. Tratak is an excellent and soothing exercise for the nerves and helps to relax the mind as well as the eyes.
Variation 2. Again, sit comfortably with your spine straight and gaze at the tip of your nose while you count to sixty. Under no circumstances should you experience any strain during this exercise and, if you do, please cease immediately. If you feel any tiredness, watering or pain, close your eyes and relax your facial and eye muscles. After the count of sixty, blink your eyes tightly a few times and keep them closed while you count to sixty again. Open them once more, gaze at the tip of your nose, blink a few times, and then close them again.
This exercise strengthens the eye muscles and increases the powers of concentration by fixing all the attention on one point and through that to the central nervous system, which will be soothed and relaxed. Always try to still the stream of circling thought and these gentle exercises will give you a manifold reward.