Keratomalacia

Keratomalacia develops when vitamin A levels drop very low, so risk rises with poor intake of vitamin A or trouble absorbing dietary fat. The main causes of keratomalacia worldwide include food insecurity, famine, or highly restrictive diets; in the US and Europe it’s more often tied to gut or liver problems that limit absorption or storage (for example celiac disease, Crohn’s, chronic pancreatitis, bile‑duct blockage), heavy alcohol use, or recent weight‑loss surgery. Medicines that block fat or bile (such as orlistat, cholestyramine, or long‑term mineral oil) and long spells of diarrhea or intestinal infections can also deplete vitamin A. Measles infection, prematurity, pregnancy and breastfeeding (because needs are higher), and zinc deficiency further increase risk; keratomalacia itself isn’t inherited. Some risks are modifiable (things you can change), others are non-modifiable (things you can’t), so improving diet when possible, treating malabsorption, vaccination, and regular follow‑up can lower the chance of deficiency.

Genetic risk factors

Genes can influence how the body absorbs, transports, and uses vitamin A, and that can shape a person’s risk of keratomalacia. Carrying a genetic change doesn’t guarantee the condition will appear, but some inherited disorders make severe vitamin A deficiency more likely. These range from rare problems with vitamin A transport to conditions that reduce fat absorption or bile flow. Knowing about these risks can prompt earlier checks if early symptoms of keratomalacia, like gritty, dry eyes or trouble seeing in dim light, start to show.

• RBP4 variants: Changes in the retinol-binding protein gene can limit how vitamin A moves through the blood. When transport is impaired, vitamin A can drop very low and raise the risk of keratomalacia.

• Abetalipoproteinemia: This rare inherited condition prevents normal packaging of fats for absorption, so fat-soluble vitamins, including A, are not taken up well. Severe deficiency can damage the cornea and the surface of the eye.

• Chylomicron retention: Variants in the SAR1B gene cause poor release of chylomicrons from the intestine. This lowers vitamin A uptake and increases risk for the corneal softening seen in keratomalacia.

• Cystic fibrosis: Changes in the CFTR gene lead to pancreatic enzyme shortages, which reduce absorption of fat-soluble vitamins such as A. Over time, low vitamin A can cause dry eye and corneal damage.

• Cholestasis genes: Inherited problems that reduce bile flow from the liver make it hard to absorb fat-soluble vitamins. Ongoing deficiency raises the chance of corneal surface breakdown and scarring.

• BCMO1 variants: Common differences in the beta-carotene conversion gene can reduce how efficiently the body makes vitamin A. Lower baseline vitamin A status may increase vulnerability to corneal dryness and injury.

Transmission

Keratomalacia is not contagious; it doesn’t spread between people through touch, air, food, or water. If you’re wondering how keratomalacia is transmitted, it isn’t—this eye problem develops from a severe lack of vitamin A, sometimes worsened by poor intake, gut problems that limit absorption, or liver disease.

It’s not inherited as a condition, though rare inherited issues that affect fat or vitamin A absorption can raise someone’s risk. Newborns and breastfed infants can be affected if the pregnant or breastfeeding parent is severely vitamin A deficient, because the baby’s vitamin A stores and milk supply may be low—this is a nutritional issue, not an infection.

When to test your genes

Keratomalacia is usually a sign of severe vitamin A deficiency, so genetic testing isn’t routine. Consider testing only if eye damage recurs despite adequate nutrition, there’s a family pattern of unexplained vitamin A metabolism problems, or your clinician suspects a rare inherited disorder affecting absorption or transport.

Looking at the long-term picture can be helpful. Keratomalacia can threaten sight quickly if vitamin A levels stay low, but with prompt treatment, many people stabilize and avoid permanent vision loss. Early care can make a real difference—restoring vitamin A and treating eye surface damage can stop further melting of the cornea and reduce scarring. In places where vitamin A deficiency is common, severe cases can still lead to partial or complete vision loss, especially if care is delayed.

The outlook is not the same for everyone, but those who receive vitamin A replacement early, address infections, and protect the eye surface often regain comfort and functional vision. Scarring from past injury may leave some blur or light sensitivity, and a few people need procedures like corneal grafts if the cornea is badly thinned. Mortality from keratomalacia itself is uncommon in high-resource settings; however, very low vitamin A levels can signal broader malnutrition and raise the risk of serious infections, especially in children, which can affect survival. Doctors call this the prognosis—a medical word for likely outcomes.

Knowing what to expect can ease some of the worry. Watch for early symptoms of keratomalacia such as worsening night blindness, very dry eyes, or haze on the cornea, and seek care right away—days matter. With ongoing care, many people maintain useful vision, particularly when nutrition is improved and follow-up is consistent. Talk with your doctor about what your personal outlook might look like.

Keratomalacia is a severe eye problem caused by very low vitamin A, so treatment focuses on quickly restoring vitamin A levels and protecting the cornea while the surface heals. Doctors typically give high‑dose vitamin A by mouth or injection using standard World Health Organization dosing schedules, and may add antibiotic eye drops or ointment to prevent infection and lubricating drops to keep the eye surface moist. If the cornea is scarred or has developed a hole, urgent eye procedures—such as tissue glues, a protective contact lens, or surgery like a corneal transplant—may be needed to save vision. Treatment plans often combine several approaches, including addressing nutrition, treating any infections like measles, and supporting overall health. Although living with keratomalacia can feel overwhelming, many people manage their symptoms and live fulfilling lives.

Keratomalacia is usually not inherited; it most often develops when the body becomes severely low on vitamin A. Still, rare genetic factors can play a role by making it hard to absorb dietary fat, move vitamin A through the bloodstream, or store it in the liver, which raises the chance of deficiency even with a reasonable diet. These inherited conditions can run in families and often appear in childhood, sometimes alongside poor growth, frequent diarrhea, or trouble seeing in dim light. If you’re wondering about genetic causes of keratomalacia, doctors look for patterns such as multiple relatives with vitamin deficiencies or unexplained corneal problems. When severe deficiency keeps returning despite nutrition support, clinicians may consider testing for disorders that affect vitamin A handling. To put these pieces together, doctors may suggest genetic counseling.

Keratomalacia often appears alongside conditions that lower vitamin A levels or make it hard to absorb fat. Measles is a well-known trigger because it rapidly depletes vitamin A stores; during or after an infection, early symptoms of keratomalacia like night vision trouble can be missed amid fever and rash. A condition may “exacerbate” (make worse) symptoms of another, which is why severe infections, diarrhea, or intestinal parasites can speed eye damage when nutrition is already limited. Long-term gut problems such as celiac disease, inflammatory bowel disease, cystic fibrosis, or after certain bariatric surgeries can reduce vitamin A absorption, and liver disease can limit storage, all raising the risk of keratomalacia. People living with protein-energy malnutrition or multiple nutrient gaps, including zinc deficiency, may experience faster progression because the body can’t move or use vitamin A efficiently. If you have any of these conditions, coordinated care and timely vitamin A treatment can protect vision while the underlying illness is managed.

How genes can cause diseases

Humans have more than 20,000 genes, each carrying out one or a few specific functions in the body. One gene instructs the body to digest lactose from milk, another tells the body how to build strong bones and another prevents the body's cells from beginning to multiply uncontrollably and developing into cancer. As all of these genes combined are the building instructions for our body, a defect in one of these genes can have severe health consequences.

Through decades of genetic research, we know the genetic code of any healthy/functional human gene. We have also identified that in certain positions on a gene, some individuals may have a different genetic letter from the one you have. We call these hotspots "Genetic Variations" or "Variants" in short. In many cases, studies have been able to show that having the genetic letter "G" in the position makes you healthy, but having the letter "A" in the same position disrupts the gene function and causes a disease. Genopedia allows you to view these variants in genes and summarizes all that we know from scientific research, which genetic letters (Genotype) have good or bad consequences on your health or on your traits.