article_snippet.sent: Now, Dr Celia Sanchez-Ramos has discovered that it can also permanently damage the retina.
article_snippet.sent: In extreme cases, Dr Celia Sanchez-Ramos says, it may even lead to macular degeneration, which causes dark patches to appear in the centre of the field of vision.
article_snippet.sent: People who suffer from eye strain are like the canaries in the mineshaft, as People who suffer from eye strain are aware of the damage being done.
article_snippet.sent: This puts strain on other parts of the eye, leading to increasing levels of inflammation, discomfort and pain.
article_snippet.sent: This condition is known as Meares-Irlen syndrome or 'visual stress'.
article_snippet.sent: This condition is thought to be caused by hypersensitivity to particular frequencies of light, whether blue, red or green.
article_snippet.sent: In response, the visual cortex - the part of the brain responsible for processing visual information - generates too much electrical activity.
article_snippet.sent: About 10 per cent of people with dyslexia are thought to have visual stress.
highlights_snippet.sent: These can can harm the light-sensitive retina, irreversibly damaging sight .
  