Blue sclera is seen in all except
keratoconus
Marfans syndrome
Osteogenesis impercta
Ehler Danlos syndrome
In keratoconus, there are no scleral changes. Blue sclerae are characteristic of connective tissue disorders like osteogenesis imperfecta, Marfan's syndrome, Ehlers-Danlos syndrome. Ref: Maheshwari 6e pg 316.
Anatomy and physiology of bone and fracture healing