A visit to the eye doctor and...

[pedroj]

My optometrist told me I was Officially blind in 2000 because of cataracts....He repaired one eye that year and the other the following year..

The difference was amazing, I could read without glasses...Not as clear today but still good..

 

[Mike D90]

At any rate, seeing the optometrist is a good idea for anyone with any vision issue. I just had a new exam yesterday and my vision has changed in less than 9 months since my prior exam.

 

[Eyelight]

The diopter adjustment simply focuses the eye piece on the focusing screen.
D3200 manual (page 20) says:

1 Remove the lens cap.
2 Turn the camera on.
3 Focus the viewfinder.
Rotate the diopter adjustment control until the
viewfinder display and focus point are in sharp
focus. When operating the control with your eye
to the viewfinder, be careful not to put your
fingers or fingernails in your eye.



It has a footnote that says:

Adjusting Viewfinder Focus
If you are unable to focus the viewfinder as described above, select single-servo autofocus
(AF-S; 035), single-point AF (c; 038), and the center focus point (040), and then frame a
high-contrast subject in the center focus point and press the shutter-release button halfway
to focus the camera. With the camera in focus, use the diopter adjustment control to bring
the subject into clear focus in the viewfinder. If necessary, viewfinder focus can be further
adjusted using optional corrective lenses (0176).

Weren't the manual what did the confusing. Were the thread.

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[STM]

My doctor's been bugging me to go see an eye doctor, since I'm borderline diabetic.
I use reading glasses now, but it is getting worse. Time to make an appointment I guess.

You really should go. Diabetes can lead to blindness, which I am sure you already know. Diabetes affects the blood vessels, especially the smaller ones, which in turn starves the nerves and other tissues for blood and they begin to die. This is the cause of diabetic neuropathy. It affects the blood vessels which feed the eyes in the very same way.

 

[FastGlass]

I'm curious how a person with bad eyesight will produce an image that is not so sharp. The camera takes the shot of whatever you point it at and focuses on what ever active focus point is being used. How does fixing your eyesight fix how sharp your images are? Nevermind. I just reread the original post and forgot he uses MANUAL focus. D'oh.

 

[Browncoat]

It sounds like you are saying that the viewfinder focus was off which made the images look clear during shooting and that by adjusting the viewfinder focus you are moving the the point the lens appears to be in focus???

I ask because I'm pretty much confused. I can see that having the viewfinder focused will allow one to see the focusing screen better, but I am at a loss as to how it moves the apparent focal point. Or does it???

Weren't the manual what did the confusing. Were the thread.

The viewfinder does not have a focus element. The little dial is a diopter adjustment, and works basically the same as the diagnostic device used at the optometrist. It's just a series of concave and convex curves to that affects how your eye picks up the image. Here is an article that goes a little more in-depth.

The viewfinder does not have any affect on how the camera functions. Zero. It does however, make adjustments to your eye.