Secondly, regarding the questions directed by Donald, as an individual ages, he or she does get prone to more eye diseases, namely cataracts, farsightedness and age related macular degeneration.

Farsightedness is the defect of vision caused by an imperfection in the eye, causing an inability to focus on near objects, but in extreme cases, they might even lose the ability to focus on objects of any distance. Patients suffering from farsightedness can experience blurred vision, accomodative dysfunction and binocular dysfunction. What these patients can do is to visit the optician and get a pair of glasses made with more convex lenses.

A cataract is an opacity that develop in the lens of the eye. It may cause near sightedness, the gradual yellowing and opacification of the lens. Cataracts may be developed due to a few reasons, and one of them because of the long-term exposure to ultraviolet rays. Another cause may be because of diabetes, hypertension and old age. Family history will also play a role in one's chance of getting cataracts.

Macular degeneration is a medical condition found in the elderly in which the centre of the inner lining of the eye, which is the macula area of the retina, suffers thinning and may bleed in serious cases. Symptoms of such diseases include the blurring of vision, shadows and missing area from vision and trouble differentiating colours. Treating such disease may include using optical coherence tomography.

Donald, you do not have to be too worried about these diseases. Just keep a healthy lifestyle and do frequent eye exercises will help to reduce your risk of getting such eye diseases.

-Dr Alexandra Yeo