Artanis said:
Sunday, April 5th, is the most optimal date by far. The Sun enters Aries, which is its strong sign, on March 20th. April 5th will be a Sunday with Moon in Virgo (healing) in a waxing moon cycle close to the full moon (which will be on April 8th).
This is actually a bit of an interesting matter here, because if your eyes are a very big issue in your life, one sun square may not be enough to fully heal them. In this case, it may arguably be better to just do a regular working with the Sun mantra instead, and to keep this going until your eyesight is fully restored and empowered.
Additionally, there is the question of whether to use Nama or Svaha in the ending. Nama is for the material realm, in the sense of influencing that which is around you, your material environment. Using Nama may lead you to finding supplements or specific foods or habits or just information, to help restore your eyesight. Svaha may cause internal and mental change to restore it, instead. Personally I think Svaha would be the correct choice for anything concerning yourself and your body, but this kind of situation has been uncertain for the longest time. So far no HP has written on this unfortunately, so we can only theorize.
Thankfully, both endings will ultimately work just fine for restoring your eyesight. It's just a question of which is more efficient. So as long as you just keep doing the working, and actively try to work on fixing your eyesight, it will be fixed. Since you have some time now until April 5th, why not test around a bit?
The mantra that should show the fastest results in my opinion is the Svaha version, so you can start a test working with this and see what effects it has on you. The power of it will be less of course, because the Sun is still in Pisces right now, but it should give you a decent idea of how the energies will affect you. If you find those energies to be lackluster for you, you will know that you should use the Nama version instead, when you start the actual working on April 5th.
You can start this test-working on March 8th, which also has Moon in Virgo like April 5th will.
Since this is merely a test-working, do make sure you cancel it atleast 3 days before April 5th comes around, so you can start the actual working there with no interference.