Long exposure to blue light may have been responsible for your symptoms. Blue light lowers the contrast on screens, causing the condition. Other factors that can contribute to eyestrain include poor lighting, failing to take regular breaks, less frequent blinking and dry air.
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The biggest challenge for me has been in coping with my perfectionism. I have a stiflingly hard time moving forward in a project if it's not 'just right' all along the way. The trap I so easily fall into is rewriting and rewriting the same scenes over and over to make them perfect, instead of continuing on into the wild unknown of the story.