Condition of red eyes is caused by dilation of small blood vessels located between the conjunctiva and white portion of the attention . Normally, vessels between the white portion and conjunctiva of the attention are invisible. thanks to environmental changes or specific eye problems, these vessels got swollen. There are few common causes of red eyes like eye allergies, chemical exposure, dry eyes, airborne allergens, pollution , overexposure to sunlight, airborne fumes, dust etc. instead of that less sleep and lifestyle-related causes too are one among the important factors that cause red eyes.