Not confirm the level of accuracy, still researching.

Vision issues are a known side effect of Ivermectin.

“Side effects of Stromectol include:

• Abdominal pain

• ALT/AST increased

• Blurred vision

• Conjunctival hemorrhage (with onchocerciasis)

• Diarrhea

• Dizziness

• Drowsiness

• Edema

• Elevated core body temperature (hyperthermia)

• Enlarged or tender lymph nodes

• Eosinophilia

• Eye damage

• Feeling as if something is in your eye(s)

• Fever

• Headache

• Hepatitis

• Hives

• Insomnia

• Itching

• Limbitis

• Low blood pressure (hypotension)

• Low white blood cell count (leukopenia)

• Mazzotti reaction (with onchocerciasis)

• Mild EKG changes

• Mild pink eye (conjunctivitis)

• Muscle pain

• Nausea

• Punctate opacity

• Rash

• Spinning sensation (vertigo)

• Tremor

• Vomiting

• Weakness/lack of energy”

https://www.rxlist.com/stromectol_ivermectin/generic-drug.htm