In the Mishkan Shilo Shabbat magazine distributed in Eretz Yisrael, Rav Adir Amrutzi writes that gazing at Chanukah candles can improve your eyesight to the point that it positively influences your eyeglass prescription. It goes down by one number, he says--baduk u'menuseh! Tried and true!
He says that gazing at the Shabbat candles can reap the same effect too.
(Rav Amrutzi writes a regular column there that provides segulot & remedies for all sorts of health issues.)
And here's another from Rav Avitan (thanks to the caring reader who made sure I saw this!):
For those who suffer from fear and anxiety...
The Ohev Israel of Apta used to tell those who suffered from anxiety and fears to look for 10 straight minutes at the chanukiah while it is lit—and to do so without interruption and without speaking to anyone.
He would tell people to sit in front of the candles and absorb the holiness of the candles.
Before the 10 minutes begin, you should ask Hashem that in the merit of the holiness of the candles, you should be blessed that your soul should be lit up so you can rejoice and be blessed with a healthy and happy soul.
It is also a time to pray for good mental health.