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Making My Own Glasses

eidel.io

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Re: Making My Own Glasses

#11

Post by djhworld »

I'm going for my regular eye test tomorrow, I'm similar to the author with toric contact lenses (for astigmatism) and glasses for all other times.

I'm not looking forward to the "does this look better or worse?" dance and can totally relate to the author's frustration!

Re: Making My Own Glasses

#12

Post by oldandcold »

Wonderful read. I've been wearing glasses for 40+ years...and I agree with the generally subjective nature of the exam. "better 1 or 2". "this one or that one"... etc. Is it just a bit less blurry? Or am I guessing because I want to get out of here? At my dox, they check my Rx with a machine, then the doc does the A/B testing. They know what the answer is...but they need me to validate. Then there is time... the doc has only so much time to do the A/B testing. A few hours of A/B would statistically improve the outcome. And really, fuzzy or sharp letters on a screen is not what I look at all day...show me a monitor or a book and ask me what I see. I would love to do my own testing with a box of lenses...

Re: Making My Own Glasses

#13

Post by AdrianB1 »

For more than 10 years I am going to the same optician for glasses. As a sport pilot, I need to have 2 pairs at all times (one is kept as reserve in the cockpit); changing one to another, with identical "everything", produces a serious discomfort that I cannot explain. I learned to live with the idea that eye sight is complicated.

Measurements at different points in time can differ slightly: in the morning just after I wake up I get some values, after staring at this monitor for 12 hours I get slightly different results. I always make the glasses from the morning measurement, but luckily the values rarely differ from one year to another (I change the lenses every year on the pair I wear on the motorcycle, riding with the visor up I get the lenses scratched in about one year from the dust in the air).

Re: Making My Own Glasses

#14

Post by alfonsodev »

chrisseaton wrote: post #7
alfonsodev wrote: post #6

Earlier quoted context omitted.

I know, I though it might a very expensive but precise way to measure that with time or new tech could become afrodable.

> I know, I though it might a very expensive but precise way to measure that with time or new tech could become afrodable. No it's imprecise - again that's a key point of the article. The author finds that there's a lot of variance in the measurements obtained.

Maybe it's the way I worded it, but I'm not debating the point of the author, sometimes in HN there are people that know more, or have more recent information than the authors of what is posted here.

Re: Making My Own Glasses

#16

Post by AdrianB1 »

megous wrote: post #9

So, anyone read the manual for the measurment instruments used and investigated what is the specified error of measurement? Maybe variation can be attributed to that.

Eye fatigue gives a much higher difference than the error margin of the instruments.

Re: Making My Own Glasses

#18

Post by gherkinnn »

> She seems to forget the fact that I’m a doctor

> As a doctor I know some things about the human eye

Something about these sentences identify our author here as German. And low and behold, it turns out he is.

Re: Making My Own Glasses

#19

Post by turk73 »

AdrianB1 wrote: post #13

For more than 10 years I am going to the same optician for glasses. As a sport pilot, I need to have 2 pairs at all times (one is kept as reserve in the cockpit); changing one to another, with identical "everything", produces a serious discomfort that I cannot explain. I learned to live with the idea that eye sight is complicated. Measurements at different points in time can differ slightly: in the morning just after…

Slightly different pupillary distance I would bet.

Re: Making My Own Glasses

#20

Post by turk73 »

I wanted to be an Optometrist but went into software engineering instead. I think Optometry is fertile ground for disruption by technology. Similar to pharmacists, the only thing keeping so many employed is a cartel.
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