Here's my problem: I love flying. I get a huge thrill at that moment when an aircraft accelerates on the runway and starts to take off. And so, since I've been a child, I've wanted to learn to fly.

But I can't. I have an unusual eye problem, one of the effects of which is that I do not have 3-D vision. So I'll never be allowed to fly an aircraft, because under Civil Aviation Authority rules my eye condition bars me from getting a pilot's licence.

I've always reasoned that although it's unfortunate that fate has determined that I will never wear a pilot's wings, the CAA must know what is and isn't necessary to fly safely, and if 3-D vision is needed, it's clearly sensible that it bans people like me from piloting aircraft. So instead of flying jumbo jets I do what my body will allow me to do and write for The Times. I've managed to live with the disappointment.

But a 21-year-old medical student, Naomi Gadian, takes a different view. Ms Gadian is dyslexic and is suing the General Medical Council because it uses multiple-choice tests as part of its qualification procedures. As a dyslexic, she finds them difficult. And she says that this means she is being discriminated against.

Forgive me, Ms Gadian, but you're missing the point. You're not being discriminated against. You're being weeded out. It's quite deliberate. If you can't read or write sufficiently well to pass a multiple-choice test, you shouldn't be a doctor.

To be blunt: someone who can't be sure to read 18mg rather than 81mg and who mistakes peroxone for paracetamol is not someone I'd want practising medicine on me - even if they had a wonderful bedside manner and a passion for medicine.

According to Ms Gadian: “Patients aren't going to ask you, ‘Here's four answers. Which one is right?'” Hmmm. Isn't that more or less precisely what patients are going to ask her? It's certainly what I do when I see a doctor. I go over alternative explanations and treatments for my symptoms and get expert advice about which one is right for me.

I'm sure that Ms Gadian is a lovely, caring woman who would, if it were not for her inability to pass the tests designed to see if she would make a good addition to the medical register, be a good addition to the medical register. But not everyone can do everything, and if she can't pass her tests, she can't practise.

It's never occurred to me that the Civil Aviation Authority is discriminating against me. There are just some things that I can do and some that I can't, because of the body I was born with. That's life. It's my lot.

The GMC should have only one response to Ms Gadian: “These are the rules. Shape up or ship out.”

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