Put on glasses and get a headache?  

You are absolutely right that the glasses have something to do with your brain complaining.  You should never, ever experience any sort of adverse symptom when wearing glasses.  No funny “pulling” sensation in your eye, no headache, and no dry eyes.  

The reason glasses may give you a headache, is an incorrect focal plane somewhere in one (or both) of those lenses.  Your visual cortex, tasked with interpreting the visual signal from your eyes is basically saying:  “There is something wrong here.”

Your brain is having to work harder to give you the correct vision experience and much like an overloaded computer getting hot, you’re now getting a headache.

Now you say, but Jake.  The optometrist said I’d get used to it!

This is true.  Your brain will eventually adapt to the focal plane and the additional strain of rendering the image will be reduced.  Also, have you ever heard of Chinese foot binding?  


It stopped hurting eventually.”

Anyway.  That was unrelated.  See how she has glasses too, though?  Double whammy!

Check out what Bob just posted in the forum the other day:

Thought I should finally post here for help. Let me post my prescriptions here first to give a few background info.

Full Glasses Prescription
L: -7.00 SPH -0.50 CYL
R: -6.00 SPH -0.50 CYL

Differential Prescription
L: -5.75 SPH
R: -4.75 SPH

I’ve gotten my differential from a friendly optometrist who’s very supportive of me in using lowered prescription for near work. With the test lenses we figured I required a 1.25 diopter reduction for my working distance from the screen.

Now here’s the deal. I’m on the point in the program where I’m getting my Normalized. You’ve given a few methods and I ended up measuring my centimeter readings with my differential. Turns out my readings between both sides weren’t close which I eventually deduced that I was overprescribed in my left eye and underprescribed in my right eye. I’m guessing that this is also the reason why my left eye feels extremely strained at the end of each day with both my glasses.

My centimeter readings with no glasses consistently give me these diopter readings.
L: -6.75 SPH
R: -6.25 SPH

Now these findings were apparent to me at the beginning of the program but I brushed it aside thinking that I may have measured myself incorrectly. These readings will probably change the plan a little with regards to spherical reduction vs equalizing as the difference is not as great as I thought it was(0.50 diopters now vs 1 diopter then).

I have since ordered new differentials and also a test normalized based on this new findings.

full thread

If you know how to measure your own eyesight, and do it properly, you’re going to be able to self-assess whether or not your lenses are the right ones.  

Of course the properly licensed establishment would throw up their arms in horror at this statement.  How could little old you, total amateur and not at all properly schooled in the high arts of optometry possibly correctly assess your myopia?  Heresy!  Knowing how to measure your eyes for myopia takes years of schooling and experience, and tens of thousands of dollars in equipment.

Not really.  Diopters are inverse meters, and nothing more.  Astigmatism, for the most part, isn’t even a thing.  All you need is an eye chart and a test lens kit, or a printed page and a 10 cent measuring tape.  Trust me, I’ve had literally thousands of students accomplish this feat successfully.

That said, I do highly recommend a friendly and supportive optometrist.  One like Bob found, is a treasure.  You will get better results with pro support, if you find the right kind (tell tale sign usually, they’ll nod and smile when you ask for a reduced prescription for close-up use).

Here’s more on headaches and glasses.