Dr Tom Smith answers your questions on staring at the sun, aneurysm scans and the side-effects of ICSI

I'm 50 and have to drive a lot. In the last few months, glare from the sun and oncoming cars has affected me much more than before. What can I do to lessen my reaction to glare?

See an optometrist. Increased sensitivity to glare can be the first sign of a cataract, in which your lens may be clouding over. Also see your doctor. If you are starting to have a cataract at this early age, you need a complete health check for conditions that increase the risk of cataracts, such as diabetes.

My 72-year-old brother, who smoked 20 a day, died suddenly last year from an aortic aneurysm in his abdomen. I'm 69 and my doctor has asked me to have a scan to see if I have one, too. Do I really need it? I'm a lot fitter than he was and don't smoke. What are my chances of having an aneurysm?

About one in five, regardless of your smoking habit. Your doctor is right. If you do have an aneurysm, it is far easier to treat it before it bursts or leaks than to wait for an emergency. Aneurysms are weak, balloon-like areas in the wall of the main artery in the abdomen. About one in 20 men over 65 have them, but if you have had a near relative with a lethal one, your risk rises. By not smoking, you are likely to have healthier arteries than your brother had, so the surgery, if you need it, should be safer.

I conceived my now six-year-old son through ICSI and read recently that it's such a relatively recent fertility treatment, we still have no way of knowing to what extent ICSI babies could be different from ones conceived naturally, in terms of DNA, immunities, etc. Should I be concerned? Is there any research?

I don't know any research that has ever shown babies born from laboratory techniques have different immunities from those conceived in the usual way. We don't have definite proof that babies born from ICSI are always unaffected by the process, but it's difficult to see why they should be different from any other baby once they have developed and been born. As for possible changes in DNA, I don't know of any mechanism by which it could be altered by this method of fertilisation. Your son is now six and is presumably healthy in every way. Please just assume that this is how he will stay: the method of conception was successful, and there is no point worrying about something that you can't alter now, anyway.

• Do you have a question for Dr Smith? Email doctordoctor@guardian.co.uk

Thanks to guardian.co.uk who have provided this article. View the original here.