Many people that suffer with red eyes find it an unsightly and an uncomfortable condition. Many things can cause the small blood vessels on the eye’s surface to bulge out, such as lack of sleep, allergies and over use of visual display units (VDUs) for example. The white part of the eye is called the sclera and it surrounds the coloured part, the iris. The sclera is creamy white in colour and the blood vessels are not normally obvious unless you do suffer with red eyes. Red eyes happen when these small blood vessels on the sclera bulge out with blood.
Most whitening drops only contain vasoconstrictors and are made for the sole use of lessening the blood vessels on the eye. Some eye whitening drops though are also made with antihistamines or lubricants to help with the itching, swelling and redness that are caused by allergies. Whitening drops do not work against infection, allergies, or any kind of viral or bacterial disease.
Ophthalmologists, opticians and manufacturers warn patients against long term use of whitening drops as overtime it can cause an over-reaction rebound effect of red eyes. The means that overtime the vasoconstrictors in whitening eye drops cause the blood vessels to shrink which reduces the blood flow to the sclera. When the whitening effect wears off the blood vessels relax and release large amounts of blood to the starved, unnourished eye. Because of this action the blood vessels start to seem larger, which makes the red eye problem worse and creates a horrible cycle of needing more and more treatment.
Using whitening eye drops often and over a long period of time can make the condition worse and in some very rare but severe cases loss of vision can occur.
If you use whitening eye drops and have any concerns of the effects or have been on them for a long period of time and are having to use them more and more, it is best to visit your eye doctor or eye clinic to get professional advice. Also if you are considering starting to use whitening drops it is best for you seek medical advice first to make sure they are the correct treatment for you and if so, your ophthalmologist or clinic can recommend the best ones for you and the correct length of treatment.