However, when there is snow on the ground there is a high degree of reflected light, so on bright, sunny, snowy days we need to be more conservative. Consequently, early and late on a summer day is safest, as is the wintertime. When the sun is lower in the sky there is more atmosphere through which the light rays travel, so fewer of them reach us. There are some considerations to keep in mind as you find your Middle Way. It has to do with burning.) If the weather is overcast, it’s still worth going outside because it will be brighter outside than in. (Skin cancer is more prevalent among office workers than among people who work outdoors. If your eye doctor specifically tells you not to do this, then, at least get some light on your skin. One approach is to spend about 20 minutes everyday outside without dark glasses, and if possible without any glasses on at all. So we need to find a middle way between too much and too little. Sunlight is essential for our health but we mustn’t get too much of the wrong kind. So, if we lose our shades we’re in worse trouble than we were to begin with. If we get in the habit of wearing sun glasses much of the time the muscle is not exercised and loses some of its capability. When we wear dark glasses the brightness of the light is diminished so the iris is not stimulated to contract as much. The iris, a sphincter muscle, which like most muscles becomes weaker if we don’t use it, controls the size of the pupil. A usual response is to go out and get sunglasses. We will tend to squint or close one eye as a way to shield them and stop so much light from entering. The eyes may water excessively and even feel painful. This can result in the eyes receiving much more light when it’s bright, than we are either used to or comfortable with. One of the things that happens when we spend hours indoors is that our pupils, (the black hole in the eye through which the light passes), no longer become small enough in response to bright light. During the six months in the sunlight the fish had developed sight.īright indoor lighting can be used as a partial substitute, but outdoor light is much brighter than even a well-lit room. As the doctor reached down to show his friend how he could pick them up, the fish swam swiftly away. About six months later an ophthalmologist friend was visiting and they went out to see the fish. He took a couple of them back to his pond. He found that he could pick them up and noticed that the fish had anatomically correct eyes, but they could not see. ![]() There’s a story about an ophthalmologist who went spelunking and found some fish in an underground lake. This means that we are more exposed to the harmful rays than we used to be. It is sadly true that particularly here in the Northeast, the ozone, which is the earth’s natural protective layer, has been eroded. We’ve been told to protect our eyes against the light all the time. There has been much discussion over the past decade about the harmful effects of sunlight on the eyes. However, natural unfiltered sunlight is necessary for our general health as well as for our eye health. We leave the office, it’s dark and on the drive home the headlights feel uncomfortably bright, or in the summertime, we go from the relative shade of a building into the sunshine and it can feel overwhelming. Dazzle and glare are often problems for those of us who spend long hours indoors.
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