If you are having trouble seeing an image first make sure that you have assembled the Oto attachment properly by sliding it into the CellScope case from right to left, until you hear it click. Next, check that you are using the appropriate tip size (as instructed by a healthcare professional). Finally make sure that your device is clean to avoid debris from blocking the light source or optical path.
If the image is still blurry, wipe the camera lens of the phone with a soft cloth to remove any dust or small particles. If the image quality is still not improved, your device may be broken. Contact firstname.lastname@example.org for additional assistance.