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A-Z Glossary

Table of Contents

Keratectomy

Jovi Boparai MD Profile Picture
Written byJovi Boparai, MD
Jovi Boparai MD Profile Picture
Jovi Boparai, MDCo-founder & CEO of CorneaCarePhiladelphia, PA

Bio

Dry eye disease is tough! I get it. I have struggled with dry eyes for several years from contact lens use, and from spending countless hours looking at computer screens. In college, my dry eyes got so bad that I couldn’t wear contact lenses, because of a constant “foreign body sensation” when I had them in. I had to stop reading every 30 minutes because my eyes would start to burn and my vision would get blurry. I tried a plethora of treatments and nothing seemed to work. Dry eye disease was not only impacting my eyes, but also my emotional wellbeing. It was preventing me from enjoying life, and getting in the way of my professional training. I felt overwhelmed, frustrated and hopeless.

It was only when I realized that my dry eyes were linked to my lifestyle, environment and overall health did things start to make sense. I noticed that on days when I spent less time on the computer, my eyes felt better. My symptoms would flare when it was windy, or when there was low humidity. I knew that if I wanted to get ahead of my dry eyes, I needed to not only treat my eyes, but to also address my lifestyle. I started a consistent regimen of artificial tears and eyelid hygiene. I switched from monthly contact lenses to daily contact lenses. I started taking scheduled breaks from looking at a computer. I ate a healthier diet focused on anti-inflammatory/antioxidants foods, and I bought a humidifier for my room. In the beginning doing all this seemed impossible, but over time it became part of my usual routine. Not only did my eyes feel better, but I was overall healthier and happier! Turns out what is good for my eyes, was also good for my mind and body. I carried this lesson with me as I started my career to become an ophthalmologist and ophthalmic surgeon.

Because of my personal journey and professional training, I believe dry eye treatment starts by listening to and empowering the patient. I listen for the struggles and cue in on their strengths, while picking up on their lifestyle. Only then do we together start building a treatment plan that incorporates good eye hygiene with small, but impactful lifestyle changes. Our sight is our most important sense, and it is intimately linked to our very being. I want dry eye patients to not only get their dry eyes under control, but to also enjoy good mental and physical health, and live a fulfilling life. What is good for the eyes should also strengthen the mind and fortify the body!

Get to know me a little better!

Hobby: vintage watches
Food: peanut butter
Superhero: Superman
Guilty pleasure: desserts
Secret power: has never had a headache

Training:

Undergraduate: University of Pittsburgh Honors College
Medical school: Weill Cornell Medicine
Ophthalmology residency: Wills Eye Hospital.

  • Last updated December 14, 2022

What is Keratectomy?

Keratectomy is the excision (removal) of a piece of the cornea. The procedure can alter the refraction of the cornea, that is, its focusing power.

There are three common types: keratectomy with an excimer laser, wedge-shaped keratectomy and lamellar crescentic keratectomy. The first such procedure with an excimer laser is used for photorefractive keratectomy (PRK). Wedge-shared keratectomy can reduce astigmatism after keratoplasty or cataract surgery. Lamellar crescentic keratectomy may help with pellucid degeneration or Terrien’s marginal degeneration.

Key Points

  • Keratectomy is a procedure that changes the refraction of the cornea.
  • There are three main types: keratectomy with an excimer laser, wedge-shaped keratectomy and lamellar crescentic keratectomy.
  • Photorefractive keratectomy (PRK) is keratectomy with an excimer laser.
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Understanding Keratectomy

Keratectomy is widely used in eye surgery. PRK is a type of corrective eye surgery that uses a laser rather than a blade to remove corneal tissue. The excimer laser was developed in the early 1970s and modified for ophthalmic use in the early 1980s. It wasn’t until 1995, however, when the Food and Drug Administration approved its use for PRK corrective eye surgery. This delay was due to safety concerns with using lasers to correct vision. With continued safety improvements and refinements, PRK has now become one of the most popular types of eye surgery.

PRK has comparable visual outcomes compared to laser-assisted in-situ keratomileusis (LASIK). Approximately 90% of PRK patients have 20/20 vision one year after surgery. However, there are some key differences. PRK has a longer recovery time than LASIK. Also, PRK is generally preferred over LASIK in patients with thin and/or irregular corneas. The main technical difference between PRK and LASIK is that LASIK creates a corneal flap and then shapes the cornea. Conversely, PRK does not create a corneal flap.

While both procedures are relatively successful, a careful evaluation is necessary to figure out which procedure is right for you.

Why You May Need the Procedure

A keratectomy may be required for many reasons. For instance, PRK can treat refractive errors, such as myopia (nearsightedness), hyperopia (farsightedness) and astigmatism. A wedge-shared keratectomy can reduce astigmatism after keratoplasty or cataract surgery. A lamellar crescentic keratectomy may help with pellucid degeneration or Terrien’s marginal degeneration.

For PRK specifically, an excimer laser is used to alter the cornea’s shape so that it can better focus light rays on the macula. The macula is the part of the retina that is responsible for color vision and visual acuity.

Keratectomy Procedure

Most keratectomy are outpatient procedures, that is, you return home the same day. Prior to undergoing the procedure, it is important to have a thorough evaluation with an eye surgeon (ophthalmologist). If you’re already undergoing cataract surgery, a wedge-shaped keratectomy may be a good option to reduce astigmatism. If you have corneal degeneration with changes in the shape of your cornea, a lamellar crescentic keratectomy may be recommended. 

For PRK specifically, your ophthalmologist will evaluate the overall health of your eyes and cornea, along with having a discussion about the visual outcomes. Importantly, the ophthalmologist will make sure your eyeglass prescription has not changed within the last year.

Exclusion criteria for PRK include pregnancy, advanced glaucoma, breastfeeding, visually significant cataracts, eye inflammation or infection, corneal scars, and other serious eye conditions.

There are several techniques for completing the procedure. PRK involves the following steps:

  • The surgeon will numb your eyes with eye drops.
  • Next, they place a holder in the eye so that you won’t blink or move your head.
  • A blade, brush, alcohol, or laser removes the outer layer of the cornea (the epithelium).
  • An excimer laser reshapes the cornea for the desired visual outcome.
  • Your doctor will prescribe non-steroidal anti-inflammatory eye drops, steroid drops, and antibiotic drops.
  • At the end of surgery, your surgeon places a clean, clear contact lens to lower eye irritation during the healing process.

The healing process is longer than LASIK because PRK does not involve a corneal flap and the corneal epithelium is removed.

Possible Side Effects

While keratectomy procedures are relatively safe and well-tolerated by patients, there are some side effects. Patients can develop corneal haze and corneal scarring with blurry vision. Other side effects include eye infections, halos around lights, dry eyes, pain, and light sensitivity. Most side effects are mild and manageable.

Bibliography

  1. Kivanany, Pouriska B., et al. “Assessment of corneal stromal remodeling and regeneration after photorefractive keratectomy.” Scientific reports, vol. 8, no. 1, 13 Mar. 2018, pp. 1-14. https://www.nature.com/articles/s41598-018-30372-2, 10.1038/s41598-018-30372-2.
  2. Nagpal, Ritu, et al. “Phototherapeutic keratectomy.” survey of ophthalmology, Vol. 65, No.1, 27 Nov. 2020, pp. 79-108, https://www.sciencedirect.com/science/article/abs/pii/S0039625718303230, 10.1016/j.survophthal.2019.07.002.
  3. Sachdev, Gitansha Shreyas, Shreyas Ramamurthy, and Ramamurthy Dandapani. “Comparative analysis of safety and efficacy of photorefractive keratectomy versus photorefractive keratectomy combined with crosslinking.” Clinical Ophthalmology (Auckland, NZ) vol. 12, 14 Aug. 2018, pp. 783. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5933339/, 10.2147%2FOPTH.S156500.
  4. Spadea, Leopoldo, and Francesca Giovannetti. “Main complications of photorefractive keratectomy and their management.” Clinical Ophthalmology (Auckland, NZ), vol. 13, 27 Nov. 2019, pp. 2305-2315, https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6885542/, 10.2147%2FOPTH.S233125.

Related Terms

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Epiretinal Membrane

is fibrous tissue (scar tissue) that forms on the top of the retina

Dacryoadenitis

is inflammation of the main or accessory lacrimal gland. The lacrimal gland secretes tears

Scotopic Vision

refers to your eyes’ ability to see in low light levels

Vitreous Hemorrhage

is caused by a disruption to current blood vessels or the growth of abnormal vessels

Tritanopia

is a type of color vision deficiency that affects the perception of color. Individuals with tritanopia have a blue-yellow defect

Asteroid Hyalosis

is a condition where small calcium particles float inside the vitreous, the jelly-like fluid that fills your eye

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