Czester opened his eyes at the age of nine days; Bonus, born some four hours later, is still blind at the age of 11 days, 48 hours behind his oldest brother. The whole litter is roughly the same size - there's no evident runt among them - but Bonus is slower to develop at this stage (he was always the camera-shy one in early photos, happily hiding under or behind the rest of his siblings).
UPDATE: Thursday 23 May, evening - I come home to find that Bonus's eyes have finally opened; 13 days after birth, all the kittens have sight.
This time last year:
Short story: The Devil is Doubt - Part One
This time two years ago:
Stormclouds are raging all around my door
This time three years ago:
Floods endanger Warsaw
This time four years ago:
Coal line rarity