Can there be ever a time when you would need a secondary cataract lasered again?

Very rarely.: On occasion, especially in a setting such as uveitis, a new membrane can re-form, causing decreased vision. Another yag laser can improve vision.

For residual tag: Occasionally a tag from the laser capsule can occlude the visual axis. In these case, the remnant capsule can be lasered again.

Typically no: Typically no, once there is a hole made in the cloudy posterior capsule(secondary cataract), there is nothing to turn cloudy. Sometimes if the original laser hole was small, the cloudy membrane can make the opening smaller and it may need lasered again, but this is uncommon.

Posterior capsular: The lens: usually clear, behind iris; is like a "pillow in a pillowcase". When cloudy/white & affecting vision, surgery needed. Goal: remove top part of pillow case (anterior capsule), remove pillow (cataract), keep back pillow case intact (posterior capsule), place a new lens; 10-20% risk need laser after 1st surgery for PCO: posterior capsular opacification. More info: eyedoc2020.blogspot.com