Originally Posted by nihil

I've never experienced a big problem and being a PC tech I'm on either my computer or some other one all day.
There were occasions when my eyes got tired and I may have had a slight problem. It sounds like you're experiencing your eyes getting tired and affecting the way the lens sits and possibly causesing a problem with focus.

I found personally that taking breaks and letting my eyes rest from the up close work of the computer generally helped. Occasionally it was just a dry contact problem and drops helped.

Although, if they're not a good fit then they'll move. Trust me I've tried almost about every toric lens on the market and one kind will work and another won't (even with the exact same 'script.) This all depends on how the rest on your eye .

If a small focus problem at the end of the day is your only problem and everything else is OK then just take breaks and be thankful you found a good lens for you.