If you find that when you don’t focus, it feels like you don’t know the objects clearly, never mind. All you have to do is to continuously know blurrily. And if you keep on repeating that, slowly over 1 or 2 days, it will become clearer by itself.
Then, you’ll see the nature of the mind in action, how when you do something repeatedly, it helps to strengthen that quality; you’ll see that happening by itself. Particularly if you’re used to focusing on one object, when you stop focusing, it can become blur; and we find that uncomfortable. Let it be; trust the process.