darkoshi: (Default)
I used to be slightly near-sighted, mostly due to astigmatism. My left eye's distance vision was worse than the right.
I got my first eyeglasses from an optometrist in 2005.
The first pair was completely wrong; they'd made some mistake with the prescription.
The 2nd pair improved my left eye's vision, but made the right eye's distance vision slightly worse.
My close-up vision wasn't a problem; I'd wanted glasses to make my distance vision better so that long distance driving wouldn't give me headaches.

At that point, I no longer trusted optometrists to be able to give me a good prescription.
I ordered a cheap pair of glasses online, with only the Cylinder and Axis parts of the last prescription, and that pair pleased me better.
I still didn't wear the glasses much, even while driving. I don't remember why; maybe my vision was better for a while or I wasn't driving long distances anyway.

Later on, my right eye's near vision got worse, sometimes giving me eyestrain with my computer work.
Wearing my glasses helped, but they improved the clarity of both eyes such that the right eye was still blurrier than the left.
My left eye's vision still felt fine to me without glasses, so to prevent the left-right mismatch I removed the left lens from the glasses.
Wearing a lens only for the right eye made my vision equal in both eyes for reading text on the computer, and I liked it that way.
I still only wore the glasses once in a while, whenever my right eye bothered me.
(My vision has been changeable all along; some days worse than others.)

In 2014, I had continuing vision problems after dealing with several chalazions. It was then I started getting annual eye exams at an ophthamologist.
I still didn't trust their prescriptons much, whether it was due to my vision being so changeable, or their tests being flawed - often I couldn't easily tell which of 2 lenses they were switching back and forth between gave me clearer vision.
Their Rxs from one year to the next were often very different, even in the axis component!

But my old glasses were no longer good enough, so I ordered two new pairs online, one based on the latest eye exam/Rx, and another pair using the Cylinder component of that eye exam but the Axis component of my old glasses.
The latter pair turned out to be better.
Glasses being so relatively cheap to order online, I then ordered a few more pairs with different Cylinder strengths and slightly varying Axis values, to see which would be best.
I printed out a ray chart to help me determine my angles of astigmatism for the best Axis values. I also tested the Axis values by covering one eye and holding a pair of glasses in front of the other eye, and rotating the lens clockwise and anticlockwise. If rotating the lens made my vision better, I knew I had to adjust the Axis value by the same angle I was turning the lens.
I started ordering only glasses with round lenses so that I could turn the lenses to adjust their Axis, if necessary.

With all that, I ended up with a pair I liked. I used it for computer work when my right eye was bothering me which happened most often in the morning. In the afternoons, my eyesight was better, and then I didn't need glasses.

Over the next years, my vision remained changeable. I started to get presbyopia, where my eyes can't focus as well on close-up things. I now often have to wear my glasses for computer work later in the day too, not only in the mornings. My left eye is best for near vision while my right eye is best for distance vision.
I ordered some new glasses for computer work, including a Sphere component for nearly the first time since those two initial unsatisfactory pairs of glasses.

In 2020, I ordered a small "trial lens kit" which is similar to what optometrists use for vision tests. It comes with a bunch of lenses of different strengths. It helps me determine what prescription would be best for new glasses.

One interesting thing is that when I work on my laptop outside in the daytime, I don't need glasses, even when I did just need them when working inside. The greater amount of light outside makes my vision clearer.

A new thing happened today that made me want to write about all this.
My pair of computer glasses make my right eye's close-up vision better.
In the past, whenever I glanced at the TV at the other end of the room, I had to lift the glasses to see the TV clearly. I considered getting bifocals or progressive lenses to avoid that, but decided against it. I simply continue putting the glasses on and off.
But today, the TV *isn't* blurry with the glasses on, and is even slightly clearer with than without them!

It seems like I should be pleased at not having to put my glasses on and off when switching between looking at the laptop and the TV.
But my right eye's vision must have gotten worse for this to be the case. On the bright side, I don't notice any difference in my distance vision with the glasses off compared to before.
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