You may have an image that is four times the image file size when doubled in size within the same format, but depending on the quality of the image, color depth and other factors this number can be different as Ernest pointed out. This number does not necessarily describe the size of the image directly as the number is different across several formats due to different image data compression algorithms and such. Retinal imaging gives your eye doctor a rapid look at more than 80 of your retina in. You will get a clear image of your eye and blood vessels, including the optic nerve located at the back of your eye. The image file size, on the other hand, is the amount of pixel data contained within the image file expressed in some unit of data (bytes, kilobytes, etc). Retinal imaging is a process where your optometrist takes a fast, easy, and comfortable digital image of your retina, or the back of your eye. Pixel density, resolution and ppi (pixels per inch) refers to the relationship of the pixels within a given dimension. Dimension and size essential describe the amount of pixels in which the image will be displayed on screen expressed in width and height. I can see that you are thinking along these lines the confusion stems from the terminology we use. By extension, images scaled for Retina displays on the iPhone are four times the pixel density because the LCD display contains four times the pixels per square inch. Images that are scaled for the Retina display on the iPhone are twice the width and height of the same image for non-Retina displays. The scars and areas of traction (pulling) can get bigger, tugging your. Extended periods of high blood sugar can damage blood vessels in your eye and cause scar tissue. Diabetes is a common cause of these retinal detachments. Ernest does a good job of explaining this in his response I simply wanted to throw in my two cents just to clear up some confusion. Tractional: In this type of detached retina, scar tissue on your retina can pull it away from the back of your eye. As Ernest Grzybowski pointed out, 'size' is a reference to the dimensions of the image in terms of its width and height in the context of 2D graphics as opposed to 'file size' or 'image size' being the size of the image on disk. I am going to assume that you are interpreting the meaning of 'size' to be the size of the image on disk and not the dimensions of the image.
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