What is the cornea, and how does it function?
The cornea is the transparent protective layer located in front of the eyes. It contains tough transparent tissue and has five layers- the epithelium (outermost layer), Bowman's layer, stroma (the thickest layer that gives the cornea its shape), Descemet's membrane, and the endothelium (a layer of cells that exists between the stroma and the aqueous humor).
The sclera and cornea are a barrier between the eyes and the outer environment. They protect the eyes from germs, dirt, and some of the sun's harmful ultraviolet light. The cornea has a crucial role in vision. When light enters your eyes, the cornea's slightly curved edge bends or refracts it, which helps keep the eyes focused and determines how well they can see far away or nearby objects.
Who is a cornea specialist?
Ophthalmologists are eye doctors trained in examining every part of the eye, including the cornea. These medical specialists help diagnose, treat, manage, and prevent eye diseases and vision loss. In addition to treating several complex eye problems, general ophthalmologists, also called comprehensive ophthalmologists, can perform surgery and prescribe contact lenses or corrective lenses for refractive errors.
What kind of education and training do cornea specialists receive?
General ophthalmologists are doctors of medicine (MDs) who must complete an undergraduate science course and attend four years of medical school. They must then complete their one-year internship and three-year residency training in ophthalmology. During residency, ophthalmologists receive clinical training on how to conduct eye examinations and surgically treat ocular conditions.
Some ophthalmologists may also choose to take the test conducted by the American Board of Ophthalmology and become board-certified.
Some ophthalmologists complete a fellowship in addition to their regular medical training. These doctors are subspecialists and receive more intensive training in one part of the eye or specific eye diseases. Ophthalmologists can subspecialize in corneal disease, retina, oculoplastics, glaucoma, neurology, and pediatrics.
What conditions do cornea specialists treat?
A cornea damaged by injury, infections, or disease can impair vision. Ophthalmologists specializing in cornea and external disease treat corneal dystrophies, conjunctival and corneal tumors, microbial infections, inflammatory conditions, and anterior ocular manifestations of systemic diseases. Cornea specialist training also involves corneal transplant surgery and other surgeries to correct refractive errors.
Some common corneal conditions include-
- Keratitis
- Keratoconus
- Corneal injuries
- Dry eye
- Corneal dystrophies
- Ocular herpes
- Stevens-Johnson Syndrome
- Iridocorneal endothelial syndrome
- Pterygium
- Corneal abrasion
- Bullous keratopathy
- Keratoconjunctivitis
When should you visit a cornea specialist?
Consider visiting an eye doctor or a top cornea specialist near you if you experience any of the following symptoms associated with corneal disorders-
- Moderate to intense pain in the eyes
- Blurred vision
- Extreme sensitivity to light
- Tearing of eyes
- Redness in the eyes
- Watery eyes
- Changes in everyday vision
- The vision gets worse over time
- Ocular trauma (for example, getting hit in the eyes)
- Pus or other discharge from the eyes
- A sensation of something stuck in the eye
In case of corneal injuries, immediately visit an emergency room or the nearest healthcare provider.
Who is at risk for developing corneal conditions?
People with a history of corneal diseases in their family may be at a higher risk of developing them. You may also be at risk if-
- You have a connective tissue disease
- You have a weakened immune system
- You rub your eyes due to hay fever or eczema
- You have recently undergone eye surgery
- You wear contact lenses for extended periods and do not clean them properly after removing them
- You were born with specific genetic mutations
How are corneal conditions diagnosed and treated?
Cornea specialists may conduct a comprehensive eye examination and other tests to diagnose your condition. Slit lamp exam aids in checking the overall health of your eye. Your eye doctor may also conduct a fluorescein eye stain test, which involves inserting a small amount of a harmless dye into your eye. They will then shine a light on your eye. This dye will detect and illuminate any scratches or damage to your cornea.
After diagnosing your corneal disease, the eye doctor will recommend treatment depending on the severity and nature of your condition. Some standard treatment methods for corneal disorders and infections include-
- Eye drops
- Eye ointments
- Oral medications
- Prescription spectacles
- Contact lenses
- Laser procedures (for instance, phototherapeutic keratectomy is a procedure that removes tissue from the cornea to modify its shape)
- Corneal transplant surgery
- Keratoprosthesis (surgery that replaces the cornea with an artificial cornea)
What happens during a comprehensive eye examination?
A comprehensive eye examination may include several tests. The eye doctor will start by taking your patient history and asking about current eye or vision problems, overall health, medications, and any work-related or environmental conditions affecting your vision. They will also inquire about previous eye or health conditions experienced by you and your family members.
The ophthalmologist will take visual acuity measurements to evaluate how each eye sees. They often use reading charts for both distance and near vision. The results are presented as a fraction, such as 20/40, indicating the clarity of your vision compared to normal distance visual acuity, which is 20/20.
The cornea specialist may conduct preliminary tests to evaluate specific visual function and eye health aspects, including depth perception, color vision, eye muscle movements, peripheral vision, and pupil response to light. Keratometry/topography tests measure the curvature of the cornea, which is crucial for fitting contact lenses correctly.
Refraction determines the lens power needed to correct refractive errors like nearsightedness, farsightedness, or astigmatism. Using a phoropter and retinoscope, the doctor will measure how lenses focus light, refining the lens power based on your feedback. The test can be performed without eye drops, although drops may be used if needed to keep the eyes from shifting focus during the exam.
Eye movement, eye teaming, and eye focusing tests assess how well your eyes change focus, move, and work together to see a clear, single image. An eye health evaluation involves using lenses, microscopes, and digital technology to check the health of all eye structures and surrounding tissues. The ophthalmologist may use dilating eye drops to enlarge the pupil for a better view of internal structures, and measuring eye pressure is part of detecting unknown eye and systemic diseases.
Which nutrients promote eye health?
While nutrition cannot cure conditions like blindness or vision loss, it can help reduce the risk of developing common eye diseases like glaucoma, cataracts, and diabetic retinopathy. In fact, certain nutritional deficiencies may play a role in the onset of these conditions.
Although vitamin and mineral supplements are available over the counter, nutrients are most beneficial when consumed naturally through fruits, vegetables, and whole foods.
The following nutrients can boost your eye health:
- Vitamin A: The eyes require specific pigments for the retina to function properly. A deficiency in vitamin A can halt the production of these pigments, leading to issues such as difficulty seeing in low light (night blindness) and dry eyes. Vitamin A helps maintain the eyes’ light-sensing cells, called photoreceptors, and also protects the cornea. Night blindness resulting from vitamin A deficiency can often be reversed with supplementation, but vision loss due to corneal scarring cannot. This vitamin is mainly available in animal products like liver, eggs, and dairy. Beta carotene, found in vegetables like kale and carrots, is converted into vitamin A in the body.
- Essential fatty acids: Omega-3 fatty acids, specifically DHA, are present in the retina and support both tear production and retinal function. Fish such as sardines, salmon, halibut, and trout are rich sources of these fatty acids. DHA is also critical for proper brain and visual development, making its deficiency in childhood a potential cause of impaired vision.
- Vitamin C: This antioxidant protects the eyes from damage resulting from free radicals, which are unstable molecules found in sources such as fried food, tobacco smoke, and UV rays. Vitamin C helps repair tissues and promote cell growth. The Age-Related Eye Disease Study (AREDS) suggests that vitamin C may reduce or delay the risk of cataracts. When combined with other nutrients, it may help delay the worsening of age-related macular degeneration and the related loss of vision. The AREDS2 formulation consists of 500 mg of vitamin C, 400 IU of vitamin E, 10 mg of lutein, 2 mg of zeaxanthin, 2 mg of copper oxide, and 80 mg of zinc oxide. Foods naturally high in vitamin C include grapefruits, strawberries, Brussels sprouts, red and green peppers, papaya, and oranges.
- Lutein and Zeaxanthin: These carotenoid antioxidants are concentrated in the macula, the central part of the retina, and help protect the eyes from harmful blue light. Studies show that a high dietary intake of lutein and zeaxanthin is associated with a low risk of chronic eye diseases and cataracts. These nutrients often occur together in green leafy vegetables such as spinach, kale, broccoli, collard greens, peas, turnip greens, and parsley. Eggs are also a good source.
Find top cornea specialists near you in the United States
Corneal diseases and infections can impair vision or even result in vision loss if left untreated. Frequent eye exams help detect problems within the cornea and other eye conditions early. They will ultimately help prevent potential vision loss and blindness, especially for those with a family history of eye diseases who are at high risk.
Finding an experienced and qualified ophthalmologist in your neighborhood or area can be challenging and time-consuming. But you needn't worry, as your search ends here! Zocdoc provides patients with an easy way of finding and booking a consultation with an eye specialist from the comfort of their homes.
To book an appointment, visit the Zocdoc website and enter your condition, location, and insurance plan. Then, browse the list of top cornea specialists and select one based on gender, distance, hospital affiliation, time of day, wait time, office location, spoken languages, and whether they treat children.
To help you choose the best cornea specialist, Zocdoc provides each doctor's medical background, clinical training, awards, licensures, specialties, and certifications as part of a unique profile. Besides that, you can also go through honest and verified reviews by past patients that will help you understand other patients' experiences.
If you need assistance finding cornea specialists who accept your insurance, our online patient help center is available. On Zocdoc, you can link your medical, dental, and vision insurance plans to your account. Keep in mind that each appointment can only use one insurance plan.
You can include your secondary insurance details in the appointment notes for those with multiple insurance plans. Additionally, if your provider uses Zocdoc's Intake forms, you can easily enter your secondary insurance information.
Zocdoc allows users to book an online or in-person consultation on the same day, in advance, post work hours (5 pm), and even on weekends to make things even more convenient. To check a provider's calendar for availability, click on the "Book online" tab next to a provider's profile and then "View all availability" to see their availability throughout the week or month.
Booking appointments with cornea specialists near you on Zocdoc is fast, free, and secure!
Statistics for corneal disorders
The Centers for Disease Control and Prevention's (CDC) Vision Health Initiative (VHI) and NORC at the University of Chicago together developed the National Vision and Eye Health Surveillance System (VEHSS), which collects data related to vision loss, vision care, and eye disorders in the United States.
In 2019, Medicare (Fee for Service) data shows that 29,607,800, or 3.2% of the U.S. population, suffer from cornea disorders. Medicare claims revealed more females (16,324,400) were diagnosed with cornea disorders than males (13,283,300). Further Medicare claims also showed that of those diagnosed with corneal diseases, nearly 0.11% had keratoconus, almost 0.99% had endothelial dystrophy (Fuchs), 0.03% had cornea conditions related to contact lenses, and 2.25% had other corneal disorders.
Sources
Cleveland Clinic[1]
Cleveland Clinic[2]
WebMD
American Academy of Ophthalmology[1]
American Academy of Ophthalmology[2]
National Eye Institute
Centers for Disease Control and Prevention[1]
Centers for Disease Control and Prevention[2]
Centers for Disease Control and Prevention[3]
Centers for Disease Control and Prevention[4]
Centers for Disease Control and Prevention[5]
American Optometric Association
Healthline
American Optometric Association
American Academy of Ophthalmology[3]
American Academy of Ophthalmology[4]
American Academy of Ophthalmology[5]
American Academy of Ophthalmology[6]
American Academy of Ophthalmology[7]
