Christina Sethi, 25, deliberately targeted victims suffering from dementia, the oldest of which was 101, who would not be able to remember what had been done to them.
She was initially charged with using a vibrator on one woman and fondling the genitalia and breast of another.
But it later emerged she had also deliberately targeted a man in his 80s who was also a resident at the South Devon care home which cannot be named for legal reasons.
One of her victims has since died.
In sentencing her to 10 years in jail, Recorder Richard Stead said she had committed "horrific abuse of three vulnerable and elderly victims who were in a care home under your care".
He said she degraded and humiliated the victims by filming the events and sending the video files to her boyfriend.
He told her: "You humiliated three elderly people who trusted you."
The judge said she had brought carers into disrepute and confirmed peoples worst fears about putting relatives into care homes.
The abuse came to light when a man who knew Sethi bought a computer from her and found deleted films of the sexual assaults which he reported to police.
Ms Scrivener said:"Video files were found which showed her sexually abusing two elderly female residents who were among the most vulnerable in the home".
Sethi knew the victim's care plans and knew exactly what was wrong with them, said the Crown.
Sethi filmed herself penetrating the anus of her first victim with a vibrator, Plymouth Crown Court was told, and sent the footage to her boyfriend.
Because she had dementia, the victim, who was in her 80s, was not able to complain.
But police said she knew that something was happening to her and detectives said the defendant was enjoying what she was doing to that victim.
The second victim was 101 years old and had dementia and limited cognitive ability.
Sethi touched her naked genitalia and breast and the victim again was confused but was aware that something happened to her. The video she filmed lasted seven and a half minutes.
After the abuse Sethi ran her finger over her mouth and asked her how that felt.
The victim tried to complain to the carer saying: "What are you doing to me?"
Miss Scrivener said Sethi sent the footage to her boyfriend and she was enjoying what was taking place.
In police interviews she said she loved her boyfriend and would do anything for him but he had not threatened her. She said she was acting in this way because "she did not want him to become distant".
And she later admitted sexually assaulting the married male victim, who was blind and has dementia, by stroking his penis after washing him. His tearful wife was in court to listen to the evidence against Sethi.
Jeff Segan, defending, said her only mitigation was her age and her guilty pleas to five counts of sexual assault.
Detective Inspector Ed Wright, who was senior investigating officer in the case, said: "Sethi committed crimes that most ordinary people could never comprehend.
"This depraved individual carried out shocking acts of abuse and grossly abused her position at the care home.
"She committed these atrocious acts on the very people she had been trusted to care for and targeted their vulnerabilities in order to satisfy her own sexual deviance.
"Sethi showed complete disregard for the welfare of her vulnerable victims, their families, her colleagues and the care home - all of whom now have to deal with the effects of her traumatic actions.
"She has shown herself to be selfish, chilling and manipulative, committing an abhorrent breach of trust and responsibility.
"We welcome todays sentence which reflects the severity and the nature of these offences, and we hope that it goes some way to bringing some closure to the victims and their families.
"We have supported the victims and their families and they have returned this support to the investigation in kind.
"This has been an emotional and difficult time for those affected by Sethi's actions and they have shown immense courage throughout this investigation.
"I hope they can take some small comfort in the fact that, by acting swiftly, police were able to ensure Sethi could not commit further crimes and we were able to safeguard those individuals who are most vulnerable in our society."
UK Mirror
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