Vitamin A Deficiency and Vision Problems

Clinical Manifestations

Vitamin A deficiency causes vision problems, including night blindness, xerophthalmia, and potentially permanent blindness if left untreated 1, 2
Night blindness is the earliest ocular symptom, caused by insufficient rhodopsin synthesis 1, 2
Bitot spots appear as gray/white, foamy lesions on the conjunctiva 1, 2
Xerophthalmia develops as deficiency progresses 1, 2
Keratomalacia can develop, leading to corneal damage 1, 2

Vitamin A is essential for synthesis of rhodopsin in the retina, critical for night vision 1, 2
Vitamin A is necessary for normal immune function, which helps prevent secondary infections that can worsen eye damage 1, 2

Liver disease shows high prevalence of vitamin A deficiency; severity increases with disease progression 1, 2
Chronic alcohol consumption depletes liver vitamin A stores 1, 2
Malabsorption conditions, including short bowel syndrome, cystic fibrosis, celiac disease, and chronic diarrhea, increase risk of vitamin A deficiency 1, 2
Bariatric surgery, particularly malabsorptive procedures, increases risk of vitamin A deficiency 3, 4
Chronic kidney disease requires monitoring as vitamin A levels can fluctuate 1, 2

Serum retinol levels should be measured in patients with suspected deficiency 1, 2
During inflammation, retinol-binding protein release from the liver is reduced, which may affect serum retinol levels 1, 2
Adjustment for inflammatory biomarkers may be necessary for accurate assessment 1, 2

Oral supplementation with vitamin A 10,000-25,000 IU daily for 1-2 weeks is recommended for clinical improvement 3, 5
Higher doses or intramuscular injections may be needed for patients experiencing night blindness 3, 5
Recheck vitamin A levels after 3 months of treatment 6

Regular monitoring of vitamin A status in high-risk patients 1, 2
Multivitamin supplements containing vitamin A for patients after bariatric procedures 4

Avoid excessive supplementation as vitamin A toxicity can occur with prolonged high doses 1, 2
The upper limit for vitamin A is set at 10,000 IU daily for women of childbearing age 1, 2
During pregnancy, the β-carotene form of vitamin A is preferred over retinol, especially during the first trimester, to avoid teratogenic risk 4