retina fatigue
Where just **looking** at a task makes you tired, before you even attempt to actually exert any physical effort to perform said task.
During an after-school visit with my teenage "horse girl" chum, she had unwisely played afternoon-volleyball with her fellow high-school-girl students at the gym, even though she had a whole trailer-load of hay-bales parked in her family's driveway to unload and put away in the barn. So when we got back to her house and her weary brown eyes first caught sight of said heaped flatbed, she just kinda stood there and stared glumly at the cart with a helpless feeling of major retina fatigue... after all that strenuous sports-exertion that she'd just put out, she rrrreeeeeaaaallllyyyyy didn't feel up to lugging dozens of ponderous weighty hay-bales twenty yards from the wagon to the barn-loft! So we compromised --- I carried the bales from the cart to the barn, and she put them away. She "paid" me for my labors with a warm grateful hug each time I brought a bale to her, and then afterwards she sat wif me on the couch and let me give her a nice long foot-rub.