Medical Definition of ophthalmology. plural. ophthalmologies. : a branch of medical science dealing with the structure, functions, and diseases of the eye.
It will be just fine! Most cake mixes only use 1 or 2 eggs anyway. Replace the water with milk if you have it and then either add an extra dash of oil or just go ahead and replace the oil with melted butter. You'll never miss that egg.
Combine cake mix, 2 eggs, and 1/2 cup of vegetable oil in a large bowl. If you used an unflavored cake mix like yellow or white then add 1 tsp. (5 g) of vanilla. Mix thoroughly with a large spoon. Use your imagination! Spice cake, Red Velvet, and Devil's Food all make great cookies, too!