Opinions come from a very personal point of view, They portray a judgement I have formed about something or someone which may not necessarily be based on facts or knowledge.
The opinions of two individuals are usually distinguishable. They might be based on assumptions that lead to changes in them over time.
However, observations are not opinions. They’re based on facts and knowledge about something you have seen, heard or noticed. Even though everyone has the same set of human eyes, different people look in different directions which leads to discrete observations about the same things.
Observations can be proven true or false while opinions can’t be proven because they’re based on a person’s judgements and sentiments. These may be deceptive but cannot be categorised as false. “This book has 700 pages” is an observation statement and “This book is too lengthy and boring” is a personal opinion.