When Wagstaff's sanity drops very low, the edges of screen become clear even when he's not wearing any glasses.
Steps to Reproduce
Start a world with Wagstaff in any DLC and set sanity to 0 or any low value. Don't equip the glasses. The edges of screen will be clearly visible.
Start a world with Wagstaff in any DLC and set sanity to 0 or any low value. Don't equip the glasses. The edges of screen will be clearly visible.
A developer has marked this issue as fixed. This means that the issue has been addressed in the current development build and will likely be in the next update.