The woman, who was only identified by her last name He, said during a press conference that she first started feeling discomfort while she was cleaning a relative's grave and the insects unknowingly flew into her eye, according to Business Insider Singapore.
Hung pulled the sweat bees out of He's eye one at a time and under a microscope without damaging their bodies. The ophthalmologist peered into the eye with a microscope, only to notice something much more unusual than a standard eye infection - tiny legs of four live sweat bees wriggling near her tear duct. Assuming it was dirt, she washed her eye out with water. Sweat bees sting, but their stings are not as painful as honey bee stings.
Sweat bees are attracted to perspiration.
It's reported He was tending to a family member's grave, pulling out some weeds when she felt something go into her eye.
"Thankfully she came to the hospital early, otherwise I might have had to take her eyeball out to save her life", Hung told reporters.
"She was wearing contact lenses so she didn't dare to rub her eyes in case she broke the lens".
He was lucky she had not excessively rubbed her eyes after feeling pain, which could have led to further damage and potentially a loss of sight. "If she did she could have induced the bees to produce venom ... she could have gone blind".
The bees were extracted, and the woman is expected to make a full recovery.
According to the Missouri Department of Conservation, sweat bees - also known as Halictidae - are small but not aggressive.
"They are still alive, they've been sent as specimens to another organisation and will be studied", said Dr Hong.