ArticleslgStudy

biology

Ophthalmia

Ophthalmia is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Ophthalmia rather than just read about it. In short: Ophthalmia (; also called ophthalmitis, and archaically obtalmy) is inflammation of the eye. It results in congestion of the eyeball, often eye-watering, redness and swelling, itching and burning, and a general feeling of irritation under the eyelids.

Key takeaways

  • Ophthalmia belongs to biology; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Ophthalmia to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Ophthalmia from memory before moving on to harder problems.

Reference excerpt

Ophthalmia (; also called ophthalmitis, and archaically obtalmy) is inflammation of the eye. It results in congestion of the eyeball, often eye-watering, redness and swelling, itching and burning, and a general feeling of irritation under the eyelids. Ophthalmia can have different causes, such as infection from bacteria, viruses, fungi, or may result from a physical trauma to the eye, chemical irritation, and allergies. A bacterial infection can result in a mucus and pus secretion. Severe cases of ophthalmia can cause blindness if not treated, especially in newborns, who contract it from the environment in the womb. Treatments vary according to the nature of the cause, with minor irritations going away on their own.

Types Types include sympathetic ophthalmia (inflammation of both eyes following trauma to one eye), gonococcal ophthalmia, trachoma or "Egyptian" ophthalmia, ophthalmia neonatorum (a conjunctivitis of the newborn due to either of the two previous pathogens), photophthalmia and actinic conjunctivitis (inflammation resulting from prolonged exposure to ultraviolet rays), and others.

Noted historical cases

Aristodemus, a Spartan captain during the Second Persian invasion of Greece, was affected by ophthalmia and was thus unable to fight at the Battle of Thermopylae (of the famous Spartan 300). However, he fought bravely and died at the Battle of Plataea. Due to the ophthalmia, and his absence from the first battle, he was not buried with proper funeral rites of a Spartan captain. Cicero, on 1 March 49 BC wrote to Atticus that he had ophthalmia. Eratosthenes, who among other things was a Greek geographer and mathematician, contracted ophthalmia as he aged, becoming blind around 195 BC, depressing him and causing him to voluntarily starve himself to death. He died in 194 BC at the age of 82. Hannibal's sight was lost in his right eye in 217 BC by what was likely ophthalmia. He lost the sight while crossing a swamp area on a four-day march through water early in his Italian campaign. Citing Galatians 4:13–15 and 6:11, Restoration Movement scholar J. W. McGarvey theorized that ophthalmia may have very well been the Apostle Paul's "thorn in the flesh" (2 Cor. 12:7). King John of Bohemia, who died in battle in 1346 at age 50 after being blind for a decade, lost his sight to this general condition. Christopher Columbus had ophthalmitis late in his life. Ophthalmitis was a common disease of sailors, possibly related to scurvy or poor nutrition. In the book Negro Builders and Heroes by Benjamin Brawley, in the chapter entitled "The Wake of the Slave-Ship", is a description of this condition affecting, on slave ships, sometimes the whole crew and captive slaves. Elizabeth Blackwell, physician in the United States, lost an eye from purulent ophthalmia contracted from an infant with an eye infection, while working in Paris at La Maternité (1849), and after loss of the eye she could no longer be a surgeon. The Spanish composer and guitar virtuoso Francisco Tárrega also had ophthalmia and seriously impaired sight after a traumatic childhood event (1850s). Hugh Fortescue, aka Lord Ebrington, (1818-1905), British Liberal MP and sanitary reformer, contracted ophthalmia in the course of a visit in 1856 to a barracks whilst researching sanitary conditions in the army. He lost sight in one eye. Richard Henry Dana Jr., author of the American classic, Two Years Before the Mast (1840), developed "a weakness of the eyes" after contracting measles while a junior at Harvard College. In an attempt to cure his condition, he undertook a two-year sailing voyage to California from Boston via Cape Horn, which provided the experiences for his memoir. The cure worked. Edward Rushton, 18th-century blind poet and slavery abolitionist, who founded the first blind school in the UK in 1776. He is believed to have caught ophthalmia while compassionately feeding slaves who had been isolated for it. Wild Bill Hickok, 1876, Hickok was diagnosed by a doctor in Kansas City, Missouri, at just 39, as his marksmanship and health were apparently in decline.

Notes

Worked examples

Example 1 — a first encounter with Ophthalmia

Start with the simplest possible case. Write down what Ophthalmia claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Ophthalmia before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Ophthalmia ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Ophthalmia

In research
Ophthalmia appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Ophthalmia in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Ophthalmia is common in secondary-school and first-year university syllabi. It links to neighbouring topics Eye diseases, Inflammations, so understanding it makes those chapters shorter.
In everyday life
Look for Ophthalmia outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Ophthalmia in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Ophthalmia means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Ophthalmia out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Ophthalmia in simple terms?

Ophthalmia (; also called ophthalmitis, and archaically obtalmy) is inflammation of the eye. It results in congestion of the eyeball, often eye-watering, redness and swelling, itching and burning, and a general feeling of irritation under the eyelids.

Why does Ophthalmia matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Ophthalmia?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Ophthalmia.

Tags

  • Eye diseases
  • Inflammations

Keep exploring