HoneyRosehad performed a routine eye test on eight- year-old Vincent Barker in February 2012.
She failed to spot the life-threatening condition that led to the boy's death after five months.
Rose had denied charges of gross negligence amounting to manslaughter but was found guilty after a trial at Ipswich Crown Court in London last year.
Today, the UK Court of Appeal admitted her plea and quashed her sentence for gross negligence manslaughter.
"This decision does not, in any sense, condone the negligence that the jury must have found to have been established at a high level in relation to the way that Ms Rose examined Vincent and failed to identify the defect which ultimately led to his death," said Judge Brian Leveson, one of the three Court of Appeal judges.
During her trial last year, the prosecution had claimed that Rose's conduct had been so far below the expected standard that it was "criminal".
The jury was told there were "obvious abnormalities" in both of Vinnie's eyes visible during the examination.
A build-up of fluid on the brain increased pressure in Vinnie's skull and ultimately led to his death.
Rosehad claimed her examination of Vinnie was tricky because he had closed his eyes to the light and looked away during the test.
The judge told the mother-of-three: "You simply departed from your normal practice in a way that was completely untypical for you, a one-off, for no good reason."
Detective Superintendent Tonya Antonis, of Suffolk Police, had said the sentence was "proportionate in the circumstances".
"It was never the Barker family's intention thatHoneyRoseshould go to prison," she said.
The victim's mother, Joanne Barker, said the family had struggled to accept Vincent's death and the impact on his siblings had been "immeasurable".
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