Unfortunately, I do not have a picture that I can post for you to see...thank goodness! But, webbing of the upper eyelid skin occurs after blepharoplasty or eyelid surgery; skin and muscle is removed from the upper lid margin from outside to inside (near the nose). At the level of the nose, there exists a depression or concavity which the surgeon must be carefull to cross. Here the incision must be modified as "bow-stringing" (aka a web or bridging of skin) occurs due to scar contracture or shortening along this area. If it does occur, reconstructive surgery may be necessary utilizing a Z-plasty or scar relaxing technique.
If you feel you notice this after eyelid surgery, discuss the issue with your surgeon as he or she may be able to help you sooner rather than later.
I hope this helps!