here is an article for surgical maxillary advancement (lefort 1)
one for maxillary advancement using a face mask
Change in Inferior Sclera Exposure Following Le Fort I Osteotomy in Patients With Midfacial Retrognathia
For facial esthetic reasons, no sclera should be exposed above or below the irises when the head of a patient who has a normal skeletal pattern is in …
www.sciencedirect.com
Inferior sclera exposure in patients with midfacial hypoplasia and retrognathia decreases significantly in accordance with the change in the lower eyelid position after maxillary advancement or impaction surgeries.
one for maxillary advancement using a face mask
Comparison of the change in inferior sclera exposure after maxillary protraction with or without skeletal anchorage Kale B, Buyukcavus M H, Esenlik E - Niger J Clin Pract
Niger J Clin Pract, Official publication of Medical and Dental Consultants’ Association of Nigeria,Nigeria
www.njcponline.com
The position of the moveable lower eyelids can change after maxillary movements and lead to a change in inferior sclera exposure
The lower eyelids of patients with midfacial retrognathia are at an inferior position owing to insufficient support provided by the maxillary bone. This leads to increased inferior sclera exposure, even in younger individuals.