Query regarding prescription changes

Child of 12 years. I am sure he does not memorize the lines so I trust him when he says he can see whatever he can see :slight_smile:

2019 prescription : Optometrist A
R -1.5 -1.5 cyl
L -1.5 -2.5 cyl
Result of wearing these glasses: Terrible nausea. He never wore them.

We were in India after that… The specialist there said seeing around 20/30 is good enough and felt the prescription given was too strong. He gave us these. Child could see 20/30 with them. Even now, he can see the same but it has gone down a bit in that he can see only a few characters of 20/30.
R -1.0
L -1.0 -0.75 cyl

Now, 2020 November prescription : Specssavers
R -3.25
L -3.25 -0.75 cyl
Result of wearing these glasses: Terrible nausea. He can see the 20/10 line too!
On checking at home, he seems to be able to see 20/20 with around -2 on both eyes.

My query is :

  1. My child can see the 20/70 line clearly without glasses. His friend has -2 lenses(tested in Sep 2020 and so up to date) and cannot see any lines without glasses.
    How is this possible that my son has been prescribed higher dioptres than the other child ?

  2. DId the astigmatism disappear in the latest test due to the reduced glasses he wore last 1 year? Shocked and pleased - but wondering if that correction has been added to the linear and so its -3.25 now?? Note that last year and this year’s tests were done at different places and I did not share the old prescription at the recent place.

Any insights are appreciated. Not asking for any dioptre advice - just trying to understand how to read the prescription.

If these measurements are stable and repeatable in artificial lighting I would think that is what you should be going off.

“around” is not terribly specific however trust your son and your measurements.

Sadly there are many cases of severe overcorrection. At least he is sensitive enough to it to not just “tough it out till his eyes adjust” Thankful with EM and online glasses as an option we don’t have to see our children’s eyes destroyed by overcorrection. Best wishes to you and your son.


Astigmatism can be a lot more complicated than cylindrical astigmatism, but cylindrical is the only type they correct for with lenses.

If the prescription lenses do not provide full acuity or cause pain/nausea, it’s definitely worth investing in test lenses. A 12 year old should be able to handle a test lense kit and experiment with them with a little bit of training. If you don’t go for a full blown test kit, a few pairs of glasses either side of what he’s most comfortable wearing will let him try moving one way or another. Kids are usually better at not tolerating what hurts them than adults. Give him the power to select the happy medium, between comfort and clarity.

He’s still got a little growing to do, so the more you can steer him to healthy vision habits the better. With too much indoor light and close work he could still get quite a bit worse before he stops growing.