<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>tobr</author><text>Am I understanding this right? The choroid layer behind the retina gets slightly thinner when we look at dark details on a bright background, and slightly thicker when we look at bright details on a dark background, and somehow this causes an opposite effect in the overall eye growth over time. So spending a lot of time looking at dark letters on a bright background would cause the eye to become too long and unable to focus on objects far away.&lt;p&gt;Is there an explanation for why the choroid changes its thickness, and why this change would create an opposite effect in eye growth over a longer period?</text><parent_chain></parent_chain></comment><story><title>Why might reading make people myopic?</title><url>http://www.eye-tuebingen.de/the-institute/news-events/news/news-article/60-why-might-reading-make-myopic/</url></story>
<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>gwbas1c</author><text>When I was a teenager I preferred white text on a black background. (Think of the DOS terminal.)&lt;p&gt;In my very early 20s, I suddenly found white text on a black background &lt;i&gt;extremely&lt;/i&gt; irritating. Suddenly, my vision was filled with persisting horizontal lines. (Like what you get when you look quickly at a light bulb.)&lt;p&gt;Maybe it&amp;#x27;s because DOS was really grey on black, but on the web, people typically do bright white on black?</text><parent_chain></parent_chain></comment><story><title>Why might reading make people myopic?</title><url>http://www.eye-tuebingen.de/the-institute/news-events/news/news-article/60-why-might-reading-make-myopic/</url></story>