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The bubbles are one of the most important elements of the OMR sheets. The bubbles found on the OMR sheets have to be filled completely in most cases. This is because the OMR software reads dark marks on the OMR sheets. This makes it important to have the correct bubble size while designing the OMR sheets.
The OMR sheet designing software provides the facility to alter the size of the bubbles to fit as many number of bubbles in one sheet of paper. However, there is an optimal size for the bubbles too. This has to be followed while designing the sheet. It is not possible to make the size of the bubbles too little to fit all the bubbles in one page.
The optimal size of the bubble is between 50-60 pixels. This provides sufficient contrast with the thickness of the outlines as well as that of the printed matter inside the bubbles.
The bubble size should not be too small as this could cause stress to the students' fingers while trying to fill the bubbles without causing the ink to spread to the nearby bubbles.
Too small bubbles would have to be read at higher sensitivity, which could lead to lot of rejections and alerts, thus increasing the time of the OMR reading process.
The size of the bubbles should also not be too large. It would take the students lot of time to fill all the bubbles completely and properly. Due to this, they would lose lot of marks as they would not be able to complete the paper.
Apart from the size of the bubbles, the distance between the bubbles should also be taken care of. There should be sufficient and equal distance between the bubbles. Avoid cramming the bubbles as this could lead to faulty reading by the software.
The size of the content or text inside the bubbles is also an important factor. The text labels should not be bold or thick as the OMR software may get confused and may regard it as a dark mark. Hence, keep the text content thin and small. This has to be maintained in case the OMR sheet is black and white.
The text content inside colored OMR sheets are dropped during scanning along with the color and hence the size of the text labels does not matter in case of colored OMR sheets.
Ensure that you follow the rules regarding the size of the bubbles while designing the OMR sheets. This would make sure that the students are able to fill the bubbles properly without any problems and the OMR software is able to read the marks without any confusion.
