People with low vision, need something to magnify the letters to be able to read it.
With this, all you have to do is place it over the text and read.
PD: English is not my native language, sorry.
Step 4: Close the lightbulb with epoxy putty
Is hard to take all the air, I fill it with water and do the close underwater.
There is no problem putting the epoxy putty under the water.
Once I have it close, I take it out and let it dry.