The phrase "diminished eyesight" is correct and usable in written English.
It is typically used to describe a decrease in the ability to see clearly. Example: As he grew older, John's eyesight began to deteriorate and he experienced diminished eyesight, which made it difficult for him to read without glasses.
The defense also argued that Cosby's age and diminished eyesight preventing him from victimizing anyone else.
My aunt seems willing to give in to my mother's need to think that she's in control, though her greatly diminished eyesight limits her mobility.
As his health declined during the last few years, Wilder began lumping his various physical problems including diminished eyesight, a cancer battle and frailties of old age into what he called his "malady".
But what bore out in our research is the extent to which diminished eyesight or blindness impacted people just as much, if not more, than some infectious diseases".
Even as diminished eyesight in her last years forced her to give up her voracious reading habit and twice weekly bridge games, she continued to attend theater, concerts, ballet and museum exhibits.
From the Washington Post: One venerable English teacher, Carl G. Wonnberger, nicknamed "the Bat" for his diminished eyesight, was known to walk into the trophy case and apologize…According to Getsinger, Romney opened a first set of doors for Wonnberger, but then at the next set, with other students around, he swept his hand forward, bidding the teacher into a closed door.
When my mother was in her 70's, she suffered severe depression as she tried to cope with diminishing eyesight.
Despite his stroke in 2001 and his diminishing eyesight, Mr. Sorensen worked on and completed "Counselor," his memoir, over the next six years.
Two autobiographies, Clinging to the Wreckage (1982) and Murderers and Other Friends (1994) speak of a life anchored in family, yet lived in a daily dramatic jumble of court cases, plays and television series, sharply observing the vanities of the world through the blur of diminishing eyesight.
Terry's last decade was plagued by health problems – colon cancer, high blood pressure and diabetes, which diminished his eyesight and caused the amputation of his right leg.
These combine with diminished hearing and eyesight; diminished mobility and balance; diminished respiratory and kidney function; and diminished cognitive abilities.
