A/ What is this instrument? Pinhole B/ What is it's clinical value? For testing central vision, if vision gets better indicates a refractive error
{"Image DocumentName": "A/ What is this instrument?", "Image ImageDescription": "Pinhole. B/ What is it\u2019s clinical value? For testing central vision, if vision gets better indicates a refractive error.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}