It is also known as disk of confusion, circle of indistinctness, blur circle, or blur spot.
From the en.wikipedia.org
Occasionally, indistinctness as a virtue is carried too far.
From the nzherald.co.nz
Yet the murkiness of public discourse often results not from willful indistinctness but simply from a blithe, untutored lack of rhetorical know-how.
From the online.wsj.com
Wolfe's coated all her music in reverb, conjuring an air of dreamy indistinctness similar to the scrim of smoke clinging to old B horror film sets.
From the sfgate.com
It's like a voice that's heard on a record from another room, where its indistinctness evinces a dreamy, eerie, almost otherworldly air.
From the thisisbristol.co.uk
What is the purpose of the indistinctness of the body swirling in the confined space of a cellulose tube in green depths inhabited by fish?
From the nzherald.co.nz
Today, the commanding heights of America's economy are financial services, and regarding them, the line between the public and private sectors is being blurred to indistinctness.
From the washingtonpost.com
More examples
The quality of being indistinct and without sharp outlines