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.
1 To substitute for 1 egg you can use ingredients you already have. 1 Egg = 2 tbsp. flour 1/2 tbsp. butter 1/2 tsp. baking powder 2 tsp. water. 2  Two years ago my daughter (who was 9) did a science project about this very subject. 3  Basically, the eggs were binders to keep the cake together (and they did add flavor...).