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Hi,

Does using binocular cause any eye pain? I used one binocular it was good but it caused some eye pain so I returned it...

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If collimation is out on the binoculars then yes this could cause eye strain where the two images do not line up correctly due to poor collimation or a knock to the binoculars.

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2 options are

1: as above the collimation is out, in which case it needs adjusting, who by is up to you, but as you have sent them back I suppose the retailer will possibly make adjustments.

2: You have 2 different eyes (right and left amongst other things) and have not adjusted the diopter setting on the adjustable binocular eyepiece. Seems that usually the right hand eye piece is adjustable so you focus on something predominently using your left eye, get that in focus and then turn the right hand eyepice adjustment to get the right hand eye view in focus. That indicates the diopter difference between your eyes. Mine are about 1/4 diopter different.

Actually getting binoculars set up and comfortable is a bit more extended then people assume. Easy to do and I tend to do it at every outing with them.

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In my experience poorly collimated binoculars either give double vision or an uncomfortable feeling (strain). Double vision can make you feel dizzy and the strain can cause a headache, but eye pain? An unsharp image in one or both eyes doesn't look good and causes no pain either.

Could you tell us more about the pain you felt? Was it in both eyes, was it a stinging pain , a dull pain or what? When did you first feel the pain?

Did you not forget to blink? If you are in Delhi, were you trying the binoculars during that really bad spell of air pollution that Delhi had a few weeks ago?

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16 hours ago, Ruud said:

In my experience poorly collimated binoculars either give double vision or an uncomfortable feeling (strain). Double vision can make you feel dizzy and the strain can cause a headache, but eye pain? An unsharp image in one or both eyes doesn't look good and causes no pain either.

Could you tell us more about the pain you felt? Was it in both eyes, was it a stinging pain , a dull pain or what? When did you first feel the pain?

Did you not forget to blink? If you are in Delhi, were you trying the binoculars during that really bad spell of air pollution that Delhi had a few weeks ago?

this is the first time am using binoculars...i didn't collimate it..next time i ll do and see...

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It's difficult to impossible to collimate binoculars, but there's a quick test to see if they are OK: http://www.nightskyinfo.com/binoculars-tests/ 

Binoculars are safe as long as you don't look at the Sun with them. Remember that the retina registers no pain and even at sunset, when the Sun looks dim in visual light, it's still too bright in infra-red light and unsafe to observe with binoculars.

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