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.
In a large bowl, combine cake mix, sugar, baking powder, and salt. Stir well. Add chocolate-cocoa mixture and egg substitute. Whisk until completely blended. Pour batter into the cake pan. Bake in the oven until a knife inserted into the center comes out mostly clean, about 30 minutes. Set aside to cool completely.