Will he be sinning if he continues to use the computer although it is damaging his sight?
Question

                I spend most of my time in front of the computer screen. As you know the its rays harm the eye sight. I do not use glasses to protect my eyes. This weakened my sight and I cannot see things clearly, all due to these rays. I know that Allah says: “Do not throw yourselves into destruction”

My question is: am I considered sinful as expose myself to harm while Allah forbade this? Please bear in mind that I do not use the computer to watch or read haram materials I only use it for research and gaining Islamic knowledge.
Praise be to Allah.It is not permissible for 
    you to continue to neglect your eyesight and cause damage to it. Even if you 
    do not care about something that will cause harm to you, Islam does not 
    approve of it. The Prophet  (peace and blessings of Allaah be upon him) 
    forbade all kinds of damage and harm, as he said: “There should be neither 
    harming nor reciprocating harm.” Narrated by Ibn Majaah (2340). 
Al-Shaatibi (may Allaah 
    have mercy on him) said in al-Muwaafaqaat (3/16): 
Harming and reciprocating 
    harm are forbidden in sharee’ah, and there is a great deal of evidence to 
    that effect, such as n the verses (interpretation of the meaning): 
    
“But do not take them 
    back to hurt them”
[al-Baqarah 2:231]
“and do not harm them”
[al-Talaaq 65:6]. 
There is also the 
    prohibition on transgressing against people, property and honour, and 
    robbing and wronging others. All of that is included in the meanings of 
    harming and reciprocating harm. That also includes offences against people, 
    or causing harm to their mental health, offspring or property.  
So it is a concept which is 
    very broad in application in sharee’ah. End quote.  
Shaykh Ibn Baaz (may Allaah 
    have mercy on him) said: Everything that harms a person with regard to his 
    religious commitment or worldly concerns, it is haraam for him to consume 
    it, whether it is poison, tobacco or anything else that is harmful, because 
    Allaah says (interpretation of the meaning):
“and do not throw 
    yourselves into destruction”
[al-Baqarah 2:195].
And the Prophet  (peace 
    and blessings of Allaah be upon him) said: “There should be neither harming 
    nor reciprocating harm.” End quote.
Majmoo’ al-Fataawa 
    (6/23-24). 
Strive to follow the 
    doctors’ advice in the way you use the computer, and pay attention to the 
    means that will not harm your eyes. Seek forgiveness from Allaah for your 
    past heedlessness, and do not neglect your health or neglect yourself in the 
    future. All of this is by the blessing of Allaah which you should preserve. 
    Then if it continues to harm your eyes, after you have taken all protective 
    measures, then there will be no sin on you, in sha Allaah, rather you will 
    be rewarded if you are patient and seek reward with Allaah. 
We ask Allaah to grant us 
    and you health and well being. 
See also the answer to 
    question no. 107305. 
And Allaah knows best.