Bengo said:Hello all,
I'm having trouble understanding the human eye and what the focal length has to do with where light converges. Why do we need a longer focal length to see distant objects and shorter to see near objects?
Thank you
Near-sightedness, also known as myopia, is a condition where a person can see objects clearly up close, but distant objects appear blurry. Far-sightedness, also known as hyperopia, is the opposite, where distant objects are clear but close objects appear blurry.
Near-sightedness and far-sightedness are typically diagnosed through a comprehensive eye exam conducted by an optometrist or ophthalmologist. This exam involves testing visual acuity, measuring the curvature of the cornea, and determining the refractive error of the eye.
Yes, both near-sightedness and far-sightedness can be corrected with glasses, contact lenses, or refractive surgery. These treatments work by altering the way light enters the eye, allowing it to focus properly on the retina.
There are several risk factors that may increase the likelihood of developing near-sightedness or far-sightedness. These include genetics, environmental factors (such as excessive screen time or reading in poor lighting), and certain medical conditions like diabetes or cataracts.
There is no proven way to prevent near-sightedness or far-sightedness. However, practicing good eye care habits, such as taking breaks from screen time, maintaining a healthy diet, and wearing protective eyewear when necessary, may help reduce the risk of developing these conditions.