Fair is an addition of 2nd folio.
"Which of the visors was it that you wore?—
Where? When? What visor? Why demand you this?"
As the whole scene is in rime, there should be a couplet here. We might then for 'this' read more.
"As precious eye-sight and did value me."
A line riming with this, before, or after, seems lost.
"Nay, my good lord, let me o'er-rule you now;