OMR examination and evaluation bodies are instructed to avoid punching the OMR sheets for filing or tying them using threads, while packaging and for storing, as such practices can hamper the OMR reading process. Tied or punched OMR sheets are likely to be rejected in the evaluation process. Let’s explore this limitation in detail.
Holes from the punched OMR sheets appear as black marks after scanning them. These black marks are detected as bubble markings by the OMR sheet reader software, thus misguiding the reader software and disrupting the evaluation process. Besides, paper dust derived from the leftover paper clippings can gradually damage the scanner lens.
Similarly, when you use threads to bind them together, they may cause considerable damage to the scanner lens, which causes substantial damage over time. For packing and storing the OMR sheets, it is a standard practice to use envelopes or packets that would fit the sheets completely, taking care not to fold them.
Addmen OMR software remains unaffected by minor damage caused by punching, as uses the four index points on the OMR sheet that are far away from the punched area. But some OMR sheets use a timeline instead of the four index points, in which case the OMR software won’t be able to read the punched sheets properly. Hence, it is instructed to avoid punching or tying the OMR sheets.