Tomorrow my half-sister has surgery to close the same macular hole for the third time. The process of recovery involves staying face down 24 hours a day for as long as six weeks, which makes recovering from cataract surgery look like a trip to the park.
I’ve discovered recently that as we get older, blindness among all of us in the developed world is increasing at a surprising rate. When I was trying to find Snead’s qualifications several months ago, I googled an article that found only 25% of the people in the UK who have myopic vision (that is, who are short- or near-sighted) were carrying a gene connected with myopia. I was astonished because I’d grown up with the idea that almost all short-sightedness was inherited. But it looks as if a great deal of our vision is affected by environmental factors. What are they?
Mostly it seems to be close work. There are many many more near-sighted people in developed countries or in pockets where people are highly educated than in the undeveloped world, even when the genetic pool is the same. It looks as if our eyes have evolved for seeing things in a distance. Writing was only invented some 7,000 years ago, and then only a very small number of people could read and write. Widespread literacy still isn’t universal, and the personal computer is barely a quarter of a century old. We haven’t had much of a chance to adapt to these new visual demands.
Reading and writing, computers and television might be principle factors in modern life that are ruining our eyesight. The old idea that it’s intellectuals who wear glasses doesn’t seem as crazy as it sounds.