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<blockquote data-quote="WayneF" data-source="post: 324655" data-attributes="member: 12496">Eyes do change as we age, but I thought 20/25 had a different meaning, about clarity, specifically that we see detail at 20 feet that normal eyes can see at 25 feet. So 20/22.5 would only be partial correction.&nbsp; Does not seem an advantage.&nbsp; <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" />&nbsp; I'd let the optometrist prescribe it.The image we see in the camera is not at 25 feet, but instead we see the image of the lens projection on the ground glass screen, at a few inches.Like looking at a mountain on the TV... it is no longer at miles of distance, but instead is an image,&nbsp; at maybe 8 to 12 feet to the TV.The cameras have an eyepiece lens to focus on the ground glass.&nbsp; My D800 manual says the eyepoint is 17mm, which is where the eye should be behind it.&nbsp; Eyeglass wearers can have issues with that, but the camera offers the diopter adjustment to vary it.</blockquote>

[QUOTE="WayneF, post: 324655, member: 12496"] Eyes do change as we age, but I thought 20/25 had a different meaning, about clarity, specifically that we see detail at 20 feet that normal eyes can see at 25 feet. So 20/22.5 would only be partial correction. Does not seem an advantage. :) I'd let the optometrist prescribe it. The image we see in the camera is not at 25 feet, but instead we see the image of the lens projection on the ground glass screen, at a few inches. Like looking at a mountain on the TV... it is no longer at miles of distance, but instead is an image, at maybe 8 to 12 feet to the TV. The cameras have an eyepiece lens to focus on the ground glass. My D800 manual says the eyepoint is 17mm, which is where the eye should be behind it. Eyeglass wearers can have issues with that, but the camera offers the diopter adjustment to vary it. [/QUOTE]

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