1, indirect ophthalmoscope's characteristics are: what he sees is an inverted image magnified by 4 times, which needs to be used with 20-day lenses, and the patient needs to fully mydriaze, and the effect is not good.
2. The feature of Auerball is that Auerball is an ultra-wide-angle laser scanning ophthalmoscope, which can scan the lens of the eye to observe fundus lesions with good results.