Red Eyes  & Infections

Viral Infections

Bacterial Infections

  • A virus consists of a core of nucleic acid (DNA or RNA) surrounded by a coat of antigenic protein.
  • The virus provides {the} genetic code for replication, whereas {the} host cell provides {the} energy and raw material for {the} virus to grow.
  • Bacteria are single cell organisms that do not have a nucleus and are among {the} most simple and most
    abundant life forms on earth.
  • antibiotics are effective against bacterial infections, not viruses.
  • Bacteria grow OUTSIDE {the} host cell and can be attacked by antibiotics

Common Conditions


  • What is blepharitis?

    • a common condition that causes inflammation of {the} eyelids.
    • tends to recur.

What causes blepharitis?

Blepharitis occurs in two forms:

  1. Anterior blepharitis Posterior blepharitis
    • affects {the} outside front of {the} eyelid, where {the} eyelashes are attached.
    • two most common causes of anterior blepharitis are
    1. bacteria (Staphylococcus)
    2. scalp dandruff.
  • affects {the} inner eyelid ({the} moist part that makes contact with {the} eye)
  • caused by problems with {the} oil (meibomian) glands in this part of {the} eyelid.
  • Two skin disorders can cause this form of blepharitis:
    1. acne rosacea, which leads to red and inflamed skin,
    2. scalp dandruff (seborrheic dermatitis).

What are {the} symptoms of blepharitis?

  • dry eye
  • foreign body
  • burning sensation
  • excessive tearing
  • itching
  • sensitivity to light (photophobia)
  • red and swollen eyelids,
  • redness of {the} eye
  • crusting of {the} eyelashes on awakening.

What other conditions are associated with blepharitis?

  • Chalazion:
    • painless firm lump caused by inflammation of {the} oil glands of {the} eyelid.


  • involves keeping {the} lids clean and free of crusts.
  • warm compresses should be applied to {the} lid to loosen {the} crusts, followed by a light scrubbing of {the} eyelid with a cotton swab and a mixture of water and baby shampoo.
  • Patients who also have acne rosacea should have that condition treated at {the} same time.
Allergic Conjuctivitis
  • Allergy eyes or allergic conjunctivitis is {the} irritation of {the} conjunctiva, or covering of {the} eyeball, as a reaction to an allergic substance to which one is sensitive. Allergic conjunctivitis, which is not contagious, causes one's eyes to become watery, red, swollen, itchy, and often painful. This condition, which is sometimes referred to as allergy eyes, might either immediately impact a person, or affect them after a period of time.
  • There are two types of allergic conjunctivitis, seasonal and perennial.

Seasonal allergic conjunctivitis affects people during specific seasons of {the} year while perennial allergic conjunctivitis impacts people throughout {the} year. Allergic conjunctivitis can cause much discomfort due to {the} symptoms listed above. In addition, untreated allergic conjunctivitis might cause someone to often rub his/her eyes, which could lead to permanent eye damage.

Allergic Conjunctivitis Causes

  • As noted, allergic conjunctivitis is not contagious. A person develops {the} condition when exposed to an allergic or sensitive substance, sometimes referred to as an allergen. Trees, grass, weeds, and flowers release {the} allergen pollen into {the} air. During {the} spring and fall months, pollen levels are at their highest. The allergen mold is also released through {the} air, from substances such as leaves, grass, and hay. It can also develop in damp atmospheres within {the} home, such as {the} kitchen or bathroom.
  • A dog or cat's dander, or skin flakes, as well as its saliva and urine can be powerful allergens. Although {the} actual hair of a pet is not considered a powerful allergen itself, {the} pet's hair or fur can collect mold, pollen, and dust.
  • Dust mites, tiny bugs that are related to spiders and ticks, also cause allergic conjunctivitis. Cleanliness, moisture levels, among other factors have impact on {the} amount of dust mites that might be found in your home.
  • Pollution is commonly associated with allergic conjunctivitis. While it comes in various forms, air pollution, such as {the} type released from automobiles and factories, is commonly one of {the} more powerful types of contamination linked to allergic conjunctivitis.
  • For those who suffer from allergy eyes, it is extremely important to identify {the} causes of allergic conjunctivitis. A person has a considerably better chance of controlling {the} condition and avoiding its unpleasant side effects once he or she is aware of {the} causes of allergic conjunctivitis.
  • Causes of Allergic Conjunctivitis - Allergens
  • Allergens are {the} most common cause of allergic conjunctivitis. Allergens are triggers or instigators of allergic reactions. Allergy eyes could be caused by one or several allergens. Thus various people might have to avoid more than one specific allergen in order to prevent allergy eyes. Although there are a large number of allergens, there are certain types that occur more prevalently with {the} condition than others.
  • Causes of Allergic Conjunctivitis – Allergen Types
  • Allergens are one of {the} primary causes of allergic conjunctivitis. There are a number of different types. Below are some of {the} more common kinds:

Pollen – Pollen is released by trees, weeds, and grasses, and is propelled by {the} wind. Pollen affects those with allergic conjunctivitis by entering {the} throats and noses of those who are sensitive to {the} substance. Pollen levels are at {the} highest during {the} spring and fall months. Pollen is considered one of {the} hardest causes of allergic conjunctivitis to control. Some common types of pollen include, ragweed, cedar and ash.

Mold – Another main cause of allergic conjunctivitis is mold. When inhaled, minuscule fungal spores can instigate allergy eyes. Mold usually impacts those who are susceptible between spring and late fall. Cold temperatures and snow diminish {the} mold spores count, yet they are still present after frost begins. Mold spores are found in leaves, hay, and grasses.

Pets – The dander, saliva, urine, and hair from household pets are other major causes of allergic conjunctivitis. Dander are tiny scales that shed off of cats and dogs. Although it is commonly thought that {the} actual hairs of pets are {the} causes of allergic conjunctivitis, this belief is inaccurate. The hair/fur of a pet itself is not one of {the} causes of allergic conjunctivitis, but {the} hair/fur can collect dander, mold, pollen, dust, each of which cause {the} condition.

Dust Mites – Dust mites are minute bugs that are one of {the} fundamental causes of allergic conjunctivitis. Dust mites can be found on {the} sofas, curtains, bed sheets, and other such places within {the} home. By often vacuuming and washing bed sheets one can reduce {the} number of dust mites in {the} home.

Causes of Allergic Conjunctivitis - Other Allergens

Beyond {the} causes of allergic conjunctivitis mentioned above, there are several other allergens that can cause {the} condition. These include:

  • Air pollution
  • Cosmetics
  • Cigarette smoke
  • Chemicals found in certain paints, carpeting
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