are oled and qled technologies to be avoided?
OLED TVs do not flicker compared to OLED phones, and if you know you are sensitive to PWM flicker should be top of your list.
Having said that, it's really not possible to know what to buy if you do not know already what causes your eye strain. It could be down to the size of the TV, the viewing conditions, a personal eye condition or even the motion processing of certain TVs. Unless you understand the reason why you are getting a problem, it's not possible to avoid 100%.
QLED TV's don't exist. They are marketing for LCD TVs, the same LCD TV tech used 20+ years now.
LCD TVs have more motion blur but less stutter, OLED TVs have less motion blur but more stutter. Some people find the stutter of OLED distracting.
It is hard not too nowadays, but as a general rule only change to a 4k TV if you plan to use 4k content. Do not change if you are still mainly watching HD content.
Are there TVs with matte screen, anti reflex, flicker free, with blue light filter/regulation, etc?
The finish of the screen, be it gloss, or matte does not decide how good the TV copes with reflections. There are glossy screens that actually have the best anti-glare performance (such as that found on the Samsung S95B). It is a myth that matte finish has less reflections.
If you know blue light causes a problem I think only LG TVs have a 'comfort mode' which reduces blue light. The LG C2 OLED is a very popular TV.
Such adjustments can also be made by any TV by manually reducing the blue hue of the picture in picture settings.
At your viewing distance as big as you can fit, but if you are also sensitive to having a larger display due to eye strain then you may have to think about smaller.
direct led i think it is of better for quality ... but for the eyes shouldn't it have a worse effect than edge led?
Direct LED is not better than edge LED unless it has a FALD system (Full Array Local Dimming).
Sadly, you are in a difficult predicament and the only way you're going to know which TV is most suited is by trying different models at home. Buy from a reputable source with a good return policy so if you do not get along with the TV, you can exchange it for another.
If you develop a clear indication of what causes the problem, narrowing down models can be easier.
I'd say the best thing is to reduce the backlight of any tv you own to see what it's like on your eyes.
On some TV's this may not be the best idea as they can use PWM to dim the screen and create more flicker at lower brightness.