Is there a term for the situation where a person knows so much about a topic or field, that she has a hard time talking about the topic with laymen because she fails to comprehend the limits of the layman’s understanding of the topic? In other words, she fails to distinguish between what is common knowledge and what isn’t, thereby failing to explain the non-obvious, which in turn leads to a complete lack of understanding from the layman.
'Blinding someone with science' is also used in a metaphorically broadened sense outside the science domain.
blind with science (British & Australian)
- If you blind someone with science, you confuse them by using technical language that they are not likely to understand.
You're also not on the same wavelength as your audience.
be on the same wavelength [phrase]
- to understand the way that another person thinks because you often have the same ideas and opinions as they do
"...fails to comprehend the limits of the layman’s understanding of the topic..."
"...fails to distinguish between what is common knowledge and what isn’t..."
may be said to be living in an ivory tower