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Hello and thank you for your question.
There is no evidence that heavy use of an LCD computer screen or even TV screen can damage your eyes. It also would not cause a permanent worsening in your vision. However, prolonged staring at anything can cause the eyes to dry out some and that can affect the moment-to-moment vision, causing blurry vision that often improves with blinking. This drying of the eyes is usually temporary unless there are other factors causing dry eyes.
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My opinion is solely informative and does not constitute a formal medical opinion or recommendation. For a formal medical opinion and/or recommendation you must see an eye doctor.
I am not personally aware of this study; I can try to find that for you if you like, but the fact that it has not been corroborated by any other study and also by the fact that there is no follow-up research on this subject suggests to me that it does not carry much clinical weight. As far as double-masked, randomized, controlled research trials that study this effect, there has been no definitive research showing this damage.
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That is an interesting study, but I think it is biased. Japanese people (and most Asian people) tend to have shorter (in length) eyes. A shorter eye is more likely to have and/or develop glaucoma, so that's why the study is biased. As far as eye strain, this is a common phenomenon in people who use their eyes heavily, such as computer users.
Does that make sense?