What is 'optimal viewing'?
Answers: If you gave us more information, close to in what context you hear the term, we might be capable of give you a better answer.
In broad it can mean "optimal viewing angle" or "optimal viewing distance".
Sometimes it help to know how far away to sit from the TV (or knowing your couch is 9 ft from the TV - what size is optimal).
I have included a relation to a seating distance calculator below.
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