Loss of contrast sensitivity occurs frequently as a complication after LASIK. The loss is attributed to higher-order aberrations (HOAs) induced by the surgery, itself, but not necessarily those that cause GASH.
I have no functional night vision, and my contrast sensitivity in low light and daylight is also affected. I did find that when wearing my scleral lenses, my daytime contrast was better, but night vision did not improve due to the plethora of other HOAs. Dr Hartzok may be able to explain the clinical aspects of loss of contrast sensitivity.