not understanding the indirect

[nyr1234]

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Hi all. I'm a 4th yr that is trying to understand indirect ophthalmoscopy drawings. my question is pretty basic. i'm not understanding how to draw what is seen. i see some residents turn the paper upside down but i dont understand why.

so is something i see at 1 o'clock really at 1 o'clock on my drawing or not? if so, why bother turning it upside down? someone mentioned vertically inverted and laterally reversed but i'm just not getting it.

so my question is basically, is a 1o'clock leasion really at 1 oclock? also, if the If i see something like a A without the horiz line (inverted V) at 1 o'clock, is it just a V at 1 o'clock or still an A without the horiz line?

I'm sorry for the really stupid question but I just don't get it.

 

[orbitsurgMD]

Hi all. I'm a 4th yr that is trying to understand indirect ophthalmoscopy drawings. my question is pretty basic. i'm not understanding how to draw what is seen. i see some residents turn the paper upside down but i dont understand why.

so is something i see at 1 o'clock really at 1 o'clock on my drawing or not? if so, why bother turning it upside down? someone mentioned vertically inverted and laterally reversed but i'm just not getting it.

so my question is basically, is a 1o'clock leasion really at 1 oclock? also, if the If i see something like a A without the horiz line (inverted V) at 1 o'clock, is it just a V at 1 o'clock or still an A without the horiz line?

I'm sorry for the really stupid question but I just don't get it.

The aerial image is reversed and inverted. Drawing on a page inverted and reversed as you see things is a way of orienting your drawing to the view as you see it.

However . . .

if you have the patient look in a specific direction, say superotemporal, you looking at the right eye, the periphery will appear inferiorly and nasally in your aerial image, but the direction you are looking into the eye is true, if you want to see the superotemporal right retina, you have the patient look up and to the right as you look into the eye toward where you expect the superotemporal right peripheral retina to be.