Related Experiment Video
Updated: Aug 19, 2026

Correction of Presbyopia by Monocular Bi-Aspheric Ablation Profile
Published on: September 20, 2024
Post-LASIK myopic shift after a trek in the North Pole
Han-Bor Fam1, E-Shawn Goh, Hung-Ming Lee
1The Eye Institute, Tan Tock Seng Hospital, Jalan Tan Tock Seng, Singapore. han_bor_fam@ttsh.com.sg
Abstract:
Bilateral laser in situ keratomileusis was performed in a 37-year-old male ethnic Chinese adventurer. Eight weeks postoperatively, the patient made an unassisted trek to the geographic North Pole. After 2 weeks in this environment, a myopic shift of more than -1.50 diopters occurred in both eyes. The myopic shift resolved over 2 months when the patient returned to a tropical climate. Using Orbscan corneal topography, we propose that the myopic shift was attributed to biomechanical changes in the cornea induced by corneal dehydration in the Arctic environment.
Related Concept Videos
Focusing of Light in the Eye
Angle Closure Glaucoma: Treatment
Open Angle Glaucoma: Treatment
Drugs such as carbonic anhydrase inhibitors, α2- and...