Hello
Colour of eyes white/yellow/ivory is based on colour of your sclera,which cannot be changed. Apart from this there are few things like dryness in eyes,
vitamin A deficiency,less haemoglobin ,jaundice etc that can lead to altered color appearance of eye. Do get tested from an ophthalmologist.
Use lubricant like refresh tears 4 times a day.
Do not rub your eyes. Reduce your screen time.