From my understanding the results are permanent. I've been lightening my eyes since January 2013, I have taken breaks (up to 2 weeks) every now and then, and my eye color hasn't converted back to dark.
Perhaps, the results may differ and vary from time to time regarding certain individuals. I haven't experience my eyes darkening up at all..... It could also be the ingredient that could be affecting the eye irises pigmentation, as well. If people are putting lemon/lime juice in their mixture then it can actually darken your eye color, opposed to making it lighter.
Consistency and patience is the key. Don't feel discouraged or deterred from your results, you'll achieve the eye color you desire if you believe that you can achieve it.
Good Luck
Perhaps, the results may differ and vary from time to time regarding certain individuals. I haven't experience my eyes darkening up at all..... It could also be the ingredient that could be affecting the eye irises pigmentation, as well. If people are putting lemon/lime juice in their mixture then it can actually darken your eye color, opposed to making it lighter.
Consistency and patience is the key. Don't feel discouraged or deterred from your results, you'll achieve the eye color you desire if you believe that you can achieve it.
Good Luck