How does light help us see

The four primary factors that influence our ability to see clearly are size, luminance, time and contrast. Everyone’s vision changes differently over time, but here are a few general guidelines. As we age, our eyes need larger type for reading, so adjustments should be made to accommodate this whether when reading a book or using a computer.

Additional light (luminance) is also required to compensate for losses that occur in the ocular system. We require as much as double the light by age 50 as we did at 20. Time also plays a role in vision; for example, when driving we have a limited time to focus on an object and have it register to see properly.As we age, this time it takes to focus is increased. Finally, the contrast between the object we are focusing on and the immediate background allow us to see much better, and this contrast becomes more important with age. We also become more susceptible to glare, so we need the extra light to be diffused, and care must be taken to ensure the source is directly shielded from our eyes.

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