Not really the blindness, but long exposure to short wavelengths of lights, like blue light, does do irreparable damage to your eyes.
It depends on two things:
- The total amount of light your eyes have to absorb, that is, How intense the light was? And how long your eyes are placed in front of that?
- The color of light. Blue light (shorter in wavelength) does more damage than the longer wavelengths of light spectrum, like Red light.
To prevent any harm you should…
Get warm colored light if you plan to use three to four hours before sleeping, Or you can simply use a blue light filter on your existing LEDs. This would be a cheaper and an instant solution, and when you are ready to replace those Daylight white LEDs, get the one with warmer color tone.