My left eye power is -0.5 where as my right eye power (for lenses) is -2.5. How is this possible?

Question

I mean how come I have to use differently powered lenses for each eye. What does it suggest? Does that mean my eyesight is really poor?

Answer 1

That can be quite normal.  I am pretty nearsighted and my right eye is weaker than my left, and my right eye is my dominate eye.  One time my right was around -5.75 and my left was -3.75.  But over the past few years since I turned 40, my far has improved, but my near has gotten worse.

Answer 2

All it suggests is that your eyes didn't develop the same way.

It is very common to have two different corrections needed.

It doesn't mean your vision is poor , it just isn't as good in your right eye as in your left.

It's nothing to worry about.