science

Eye surgery

Eye surgery is a science 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 Eye surgery rather than just read about it. In short: Eye surgery, also known as ophthalmic surgery or ocular surgery, is surgery performed on the eye or its adnexa. Eye surgery is part of ophthalmology and is performed by an ophthalmologist or eye surgeon.

Key takeaways

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

Reference excerpt

Eye surgery, also known as ophthalmic surgery or ocular surgery, is surgery performed on the eye or its adnexa. Eye surgery is part of ophthalmology and is performed by an ophthalmologist or eye surgeon. The eye is a fragile organ, and requires due care before, during, and after a surgical procedure to minimize or prevent further damage. An eye surgeon is responsible for selecting the appropriate surgical procedure for the patient, and for taking the necessary safety precautions. Mentions of eye surgery can be found in several ancient texts dating back as early as 1800 BC, with cataract treatment starting in the fifth century BC. It continues to be a widely practiced class of surgery, with various techniques having been developed for treating eye problems.

Preparation and precautions

Since the eye is heavily supplied by nerves, anesthesia is essential. Local anesthesia is most commonly used. Topical anesthesia using lidocaine topical gel is often used for quick procedures. Since topical anesthesia requires cooperation from the patient, general anesthesia is often used for children, traumatic eye injuries, or major orbitotomies, and for apprehensive patients. The physician administering anesthesia, or a nurse anesthetist or anesthetist assistant with expertise in anesthesia of the eye, monitors the patient's cardiovascular status. Sterile precautions are taken to prepare the area for surgery and lower the risk of infection. These precautions include the use of antiseptics, such as povidone-iodine, and sterile drapes, gowns, and gloves.

Laser eye surgery

Although the terms laser eye surgery and refractive surgery are commonly used as if they were interchangeable, this is not the case. Lasers may be used to treat nonrefractive conditions (e.g. to seal a retinal tear). Laser eye surgery or laser corneal surgery is a medical procedure that uses a laser to reshape the surface of the eye to correct myopia (short-sightedness), hypermetropia (long-sightedness), and astigmatism (uneven curvature of the eye's surface). Importantly, refractive surgery is not compatible with everyone, and people may find on occasion that eyewear is still needed after surgery. Recent developments also include procedures that can change eye color from brown to blue. Before proceeding with laser surgery, the eye specialist needs to certify that the patient is a suitable candidate for the surgery and there are several factors to be considered before doing laser surgery.

Cataract surgery

A cataract is an opacification or cloudiness of the eye's crystalline lens due to aging, radiation, disease, or trauma that typically prevents light from forming a clear image on the retina. If visual loss is significant, surgical removal of the lens may be warranted, with lost optical power and preoperative refractive power usually replaced with an implantable intraocular lens. Owing to the high prevalence of cataracts, cataract extraction is the most common eye surgery. Rest after surgery is recommended.

Glaucoma surgery

Glaucoma is a group of diseases affecting the optic nerve that results in vision loss and is frequently characterized by raised intraocular pressure. Many types of glaucoma surgery exist, and variations or combinations of those types can facilitate the escape of excess aqueous humor from the eye to lower intraocular pressure, and a few that lower it by decreasing the production of aqueous humor.

Refractive surgery

Refractive surgery aims to correct errors of refraction in the eye, reducing or eliminating the need for corrective lenses.

Keratomileusis is a method of reshaping the corneal surface to change its optical power. A disc of the cornea is shaved off, quickly frozen, lathe-ground, then returned to its original power. Automated lamellar keratoplasty Laser-assisted in situ keratomileusis (LASIK) Laser assisted subepithelial keratomileusis (LASEK), a.k.a. Epi-LASIK Photorefractive keratectomy Laser thermal keratoplasty Conductive keratoplasty uses radio-frequency waves to shrink corneal collagen. It is used to treat mild to moderate hyperopia. Limbal relaxing incisions can correct minor astigmatism Astigmatic keratotomy, arcuate keratotomy, or transverse keratotomy Radial keratotomy Hexagonal keratotomy Epikeratophakia is the removal of the corneal epithelium and replacement with a lathe-cut corneal button. Intracorneal rings or corneal ring segments Implantable contact lenses Presbyopia reversal Anterior ciliary sclerotomy Scleral reinforcement surgery for the mitigation of degenerative myopia Small incision lenticule extraction

Corneal surgery Corneal surgery includes most refractive surgery, as well as:

Corneal transplant surgery is used to remove a cloudy/diseased cornea and replace it with a clear donor cornea. Penetrating keratoplasty Keratoprosthesis Phototherapeutic keratectomy Pterygium excision Corneal tattooing Osteo-odonto-keratoprosthesis is surgery in which support for an artificial cornea is created from a tooth and its surrounding jawbone. This is a still-experimental procedure used for patients with severely damaged eyes, generally from burns. Eye color-change surgery through an iris implant, known as Brightocular, or the stripping away the top layer of eye pigment, known as the stroma procedure

Vitreoretinal surgery

Vitreoretinal surgery includes:

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with Eye surgery

Start with the simplest possible case. Write down what Eye surgery claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Eye surgery 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 Eye surgery 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 Eye surgery

In research: Eye surgery appears in science 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 Eye surgery 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: Eye surgery is common in secondary-school and first-year university syllabi. It links to neighbouring topics Ophthalmology, Surgical specialties, so understanding it makes those chapters shorter.
In everyday life: Look for Eye surgery 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.

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How to study Eye surgery in 20 minutes

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

Frequently asked questions

What is Eye surgery in simple terms?

Why does Eye surgery matter?

Because it connects several science 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 Eye surgery?

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 Eye surgery.