Hi. I'm online and happy to answer your question today.
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There are a couple of possible causes for the streak you are seeing after laser. The most likely is that a piece of the posterior capsule flap is still hanging across your visual axis. This is real easy to treat by having the errant capsule flap "polished" with the same YAG laser used for your initial treatment.
Another, much less likely, reason for your visual symptoms is pitting of your intraocular lens. This would be harder to treat. A complete exam by your surgeon should easily be able to pinpoint the cause of the streaks you are seeing at night and outline an appropriate treatment plan
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In the vast majority of cases your visual difficulties should be able to be resolved with little to no risk to your eye.