“Red eyes” is a generic term used to describe reddish, irritated, inflamed eyes and with dilated blood vessels. 
They can also be a symptom of:

  •  Subconjunctival hemorrhage or injury to blood vessels,
  • Blepharitis  or inflammation of the eyelids,
  • Inflammation of the sebaceous glands of the eyelids,
  • Special effects of contact lenses that create a red-eye effect.


Red eyes can range from a bright red that completely covers the sclera to a few enlarged blood vessels that look like sinuous red or pink lines on the sclera (white part of the eye).


Causes of red eye

Red eyes are often called ” allergic eyes ” since redness of the eyes is a common indicator of allergic reactions .
When the immune system reacts to a foreign substance such as:

  • Pollen,
  • Hairs of pets,
  • Dust,
  • Chemicals present in makeup or contact lenses,

has an inflammatory reaction and releases histamine to “fight off” the culprit allergens.
The consequence is that the released histamine causes a dilation of the blood vessels in the eyes, makes them red and causes  tearing .
According to conventional medicine, the treatment foresees avoiding allergens if it is possible or taking medications recommended by the doctor, such as  antihistamine drops , to control the symptoms of allergic rhinitis .


Contact lenses

One of the main culprits for red eyes is the excessive use of lenses or dirt that can keep irritants or microbes on the surface in contact with the eyes.
Red eyes while the person is wearing the lenses may be the sign of a serious eye infection , including fungal keratitis .

Contact lenses may also worsen dry eye syndrome , since they generally reduce the amount of oxygen that reaches the cornea and may limit normal fluid production.
It is possible to reduce the risk of red-eye induced by contact lenses if they are kept clean, disinfected and replaced according to the ophthalmologist’s instructions.
The doctor may recommend daily disposable lenses or other material for contact lenses, such as gas permeable contact lenses.
There are a few drops that can be applied to the eyes after putting the contact lenses.

Computer Vision Syndrome
Red, tired, and blazing eyes can occur when we look at a computer screen for a long time.
One of the reasons is that during the work with the computer we hit less the eyelids and therefore the surface of the eye becomes dry.

The blepharitis causes inflammation of the eyelids and eyelashes, it can be caused by poor hygiene of the eyelid.
The most frequent causes of blepharitis are:
1. Allergic reactions ,
2. Bacterial infections,
3. Lice on the eyelashes.

In case of blepharitis, it is possible to notice:

  • A feeling of sand or foreign body,
  • Sensation of burning eyes,
  • Excessive tearing,
  • Itching ,
  • Red and swollen eyelids,
  • Eyelid crusts.

This disease is not contagious and usually does not cause permanent damage to the eyes.

The uveitis is inflammation of the uvea of the eye and can cause:

  • Redness,
  • Pain ,
  • Blurred vision,
  • Eye floaters,
  • Photophobia .

Symptoms of this disease may occur suddenly and may worsen very quickly.
Uveitis should be treated quickly because if the person waits too long, complications such as:

Dry eyes
Tears protect the eyes because they lubricate and nourish the surface of them.
When the tears are gone, the eyes can become dry and irritated.
Chronic dryness can cause inflammation of the surface of the eye and dilation of blood vessels.

The chalazion is a cyst that forms the eyelid due to a chronic inflammation of glands that produce tears of the lipid component.
If the cyst becomes large it can cause discomfort by friction and can cause astigmatism and pain in the eyes due to pressure on the cornea.


The stye is an inflammation of the sebaceous glands at the base of the eyelashes.
The consequence is a swelling of the eyelid that contains pus; causes discomfort as if there were a foreign body inside the eye.

Redness may occur following an injury to the eye.
The blood vessels in the eyes become larger and dilate to stimulate the cells to heal and repair the damage.

Keratitis or inflammation of the cornea
If the cornea of ​​the eye becomes infected, the blood vessels dilate and swell due to the arrival of the cells that fight the infections. These cells can cause visible redness.

Corneal ulcer
It is an open wound on the cornea.
Usually the cause is:

  • Corneal infection,
  • Trauma,
  • Contact lenses.

Because it is a medical emergency, the individual should seek the emergency room when it occurs.
The symptoms are as follows:

  • Red eyes,
  • Pain in the eyes,
  • photophobia,
  • Reduction of visual field,
  • Sensation of sand in the eyes,
  • Excessive tearing.

Subconjunctival hemorrhage 
A broken capillary often causes subconjunctival hemorrhage.
When the blood vessels rupture, they bleed and spread the contents under the conjunctiva.
Subconjunctival hemorrhage may be caused by:



Also known as “pink eye”, conjunctivitis is one of the most frequent (and contagious) eye infections, especially among children in school.
The conjunctiva is a thin, transparent membrane that covers the sclera and eyelids.
Conjunctivitis is conjunctival infection and can be caused by:

  • Allergies,
  • Bacteria,
  • Virus
  • Toxic substances.

Conjunctivitis is very common but is not usually severe.
When the conjunctiva is infected, the blood vessels in the interior become irritated, swell and the eye becomes red or pink.

Acute angle glaucoma
The glaucoma acute closed – angle is a serious medical emergency that must be treated immediately.
This severe type of glaucoma causes a painful redness that usually occurs in one eye.

Flu and colds
Red and swollen eyes, along with runny nose, are frequent cold or flu symptoms .
The red eyes in this case are caused by an infection or by obstruction of the paranasal sinuses, especially when they are accompanied by sneezing and coughing.

Hormonal changes during pregnancy can affect the eyes in several ways.
The eyes may become red, dry, itchy, and sensitive to light.
Pregnancy can also change the shape of the cornea that may develop contact lens intolerance or blurred vision.
The redness of the eyes and other symptoms are usually temporary and resolve completely within a few weeks or months after delivery.

The dangers of cigarette smoke to the heart, lungs and diseases associated with smoking are known, but did you know that smoking also harms the eyes?
In addition, it significantly increases the risk of:

Tobacco smoke is a toxic irritant to the eyes and can also cause dry, itchy, red eyes.

Smoking marijuana causes red eyes.
The main psychoactive ingredient in marijuana ( THC or tetrahydrocarbinol) causes a significant dilation of the blood vessels in the eye, producing eye redness that can last for several hours or longer.

Excessive alcohol consumption can cause red eye.
Alcohol reduces oxygen in red blood cells, causing dilation of the ocular blood vessels.

Environmental and workplace hazards .
Extremely dry air, dust, smoke and excessive exposure to the sun are irritating elements that can cause red eyes, among other symptoms.
Corneal injuries caused by windborne particles such as sawdust, sand, metal chips or glass can cause serious eye injury.
It is always necessary to wear goggles if there is a risk of foreign bodies entering the eye:

  • During work,
  • Doing sports,
  • In the chores around the house, like mowing the lawn.

The appearance of the eyes can be a sign of fatigue  and insomnia .
Puffy eyes and dark circles are signs that the individual does not get enough sleep.
Caution: Rubbing the drowsy eyes aggravates the symptoms.

Chlorine and other products for disinfecting pool water can cause redness of the eyes.
In addition, bacteria found naturally in any type of water, including the oceans, lakes and rivers, can cause red eye.
It is often best to put on goggles while swimming or before a swim to avoid red or irritated eyes after swimming.


Treatment and remedies for red eyes

  • In situations where fatigue or tiredness are the causes of red-eye, no therapy is necessary.
  • For more severe cases of red eye that do not pass in a short period of time, it is necessary to consult the ophthalmologist.
  • Eye drops are usually prescribed to provide relief.
  • The eyes may need a saline wash to remove the foreign bodies.
  • If the doctor diagnoses the pink eye (conjunctivitis), avoid touching the infected area and rubbing the other eye because this disease is very contagious.


Diet and natural food

According to  Dr. Mozzi / D’Adamo’s blood type diet , some foods cause an inappropriate immune response that causes red eye and other diseases.
To resolve this disorder you need to change the food, excluding foods that are not suitable for people of the patient’s blood type.
A person with blood type “0” can eat meat (except pork) and fish but should reduce or avoid:

  • Cereals (especially those with gluten),
  • Dairy products (yogurt, cheese, mozzarella, etc.),
  • Fruits.

According to the hygienist Shelton and Lezaeta’s natural medicine , the eyes are affected by “unclean” blood, like other organs.
To not have red eyes you must follow a diet without:

  • Animal proteins (meat, fish, milk and dairy products),
  • Fast food type products,
  • Processed and cooked foods sold in supermarkets,
  • Salt and pepper.

The recommendations are:

  • The ideal foods are raw fruits and vegetables, nuts, seeds, fresh vegetables and potatoes,
  • One should only eat when hungry,
  • Drink distilled water because it does not contain inorganic salts that are harmful to the body,
  • Drink a little and at least 10 minutes before meals,
  • Do not take medication.


Natural Treatments for Red Eyes

Holistic and natural treatments can greatly help resolve red-eye disorders.
Conventional treatment often involves eye drops that can cause drug dependence and side effects.

This is not the case with herbal remedies.
Herbs like Vaccinium myrtillus (boldo) help to facilitate the transport of oxygen and nutrients to the eye.
This herb has been the subject of numerous studies and research related to the eyes.
Aspalathus linearis (also called Rooibos, Red Bush or red tea) is a product that serves to strengthen the immune system.

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