Corneal Examination: Diagnostic Methods, Indications, and Examination Results
The cornea is the first to react to dryness, infection, microtrauma, and contact lenses. Its shape, thickness, and transparency determine the clarity of vision and the safety of treatment.
At K+31, corneal examinations are comprehensive: the doctor compares the patient's complaints, instrument data, and the condition of the eye.
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When do we recommend a corneal examination?
Corneal examinations are prescribed for complaints, before surgeries, and after injuries, burns, inflammatory diseases, and interventions. If vision suddenly worsens, it's best not to wait for the scheduled appointment.
Examination before surgery and correction selection
Before surgery, it's important to know whether the tissue is stable and thick enough. If laser vision correction, cataract removal, or a prescription for complex lenses is planned, the doctor may prescribe:
- Keratometry
- Keratotopography
- Corneal pachymetry
- Tomographic scanning
This allows the doctor to assess risks in advance and make a decision after an in-person examination.
Complaints that require an appointment for diagnostics
An ophthalmologist should be consulted if the patient experiences pain, redness, photophobia, tearing, stinging, glare, a foreign body sensation, or decreased visual acuity. The doctor will ask whether the patient wears contact lenses and whether they have had any infections, injuries, surgeries, or chemical irritation.
The cornea is sensitive to dryness, inflammation, and improper lens fit. Without an examination, it's difficult to determine whether the cause is on the surface, deep within the tissue, or elsewhere in the visual system.
Monitoring after Treatment and Injuries
After inflammation, a burn, a foreign body, surgery, or prolonged irritation, it's important to understand how healing is progressing. The doctor evaluates the corneal surface, swelling, sensitivity, and cloudiness, if any, that developed after the injury.
Repeat corneal examinations show progress and help adjust monitoring schedules.
What methods of corneal examination do we use?
The method is chosen by the ophthalmologist after a conversation and initial examination. Below are the main methods that help assess the anterior segment of the eye.
Slit Lamp Examination
A slit lamp provides a magnified image of the anterior structures of the eye. During the examination, biomicroscopy is performed: the doctor can see the surface, tear film, epithelium, stromal layer, and any opacities.
A slit lamp also helps detect microdefects after staining and determine whether additional measurements are needed.
Keratometry
Keratometry measures the curvature of the central zone of the anterior surface. This method is important for astigmatism, preparation for surgery, and selection of optical correction.
If the results are unstable, an extended surface map is prescribed.
Corneal Pachymetry
Corneal pachymetry measures tissue thickness at selected points or maps its distribution. This measurement is important when suspecting keratoconus, before refractive surgery, for edema, and for post-treatment monitoring.
A thin zone, asymmetry, or dynamic changes in the data help determine whether more frequent monitoring is necessary.
Keratotopography and Keratotomography
Keratotopography creates a map of the anterior surface and shows the distribution of refractive power. Corneal topography is useful for irregular astigmatism, poor lens tolerance, and suspected shape changes.
Corneal tomography evaluates the anterior and posterior surfaces, thickness distribution, and signs of thinning. These data help identify early keratoconus when a routine eye exam fails to explain the symptoms.
Anterior Segment Optical Coherence Tomography
Anterior segment optical coherence tomography creates a layered image of tissue without incisions or eye contact. This method helps assess the depth of opacities, scars, swelling, and post-operative conditions.
OCT is important when the physician needs to understand not only the presence of a change but also its location.
Endothelial Microscopy
Endothelial microscopy evaluates the cells of the inner layer, which maintains normal tissue water balance. If the cells are few or altered, the risk of postoperative edema increases.
The corneal endothelium is especially important before surgery, after keratoplasty, and in cases of dystrophies and chronic edema.
Confocal Microscopy
Confocal microscopy provides a layered image of tissue at the cellular level. This method is used according to the following indications:
- Complex inflammation
- Suspected specific lesion
- Dystrophies or unclear pain
The decision to prescribe is made by the physician after assessing the patient's complaints and previous data.
Before choosing a method, the physician compares several parameters. For the patient, differences are easier to see through comparison.
| Method | What it shows | When it's needed | Features |
|---|---|---|---|
| Biomicroscopy | surface, transparency, inflammation | initial examination | quickly |
| Corneal pachymetry | tissue thickness | keratoconus, preparation for surgery | indicator Thickness |
| Keratometry | Central curvature | Astigmatism, optical calculation | Evaluates refraction |
| Corneal topography | Shape and distribution of curvature | Lens fitting | Non-contact |
| Endothelial microscopy | Inner layer cells | Surgeries, dystrophies | Tissue reserve |
This table does not replace a consultation. The doctor selects a set of tests after the examination.
General information
When a corneal examination cannot be postponed
A scheduled appointment is not always appropriate. If symptoms are severe, consult a doctor immediately.
Pain, redness, and photophobia
Severe pain, redness, photophobia, and excessive tearing may indicate corneal inflammation, erosion, keratitis, trauma, or lens complications. Waiting several days is dangerous.
Decreased vision and a "foggy" sensation
Sudden decreased vision, haze, glare, a filmy sensation, or severe swelling require an in-person examination. The doctor determines whether the cornea's transparency has changed, whether there is an infiltrate or scar.
Trauma, burn, or severe eye irritation
After exposure to a chemical, wood shavings, twig, sharp object, or hot steam, the eye should be examined by a specialist. The doctor assesses the depth of the defect, the condition of the eyelids, and the risk of infection.
Frequently Asked Questions
What does the examination reveal?
Is a corneal examination painful?
Is any preparation necessary for a corneal examination?
When is a corneal examination prescribed?
Conclusion: When it is important not to delay a visit
A corneal examination is recommended if your vision has become unstable, you experience pain, photophobia, redness, blurred vision, or discomfort from your lenses. This also applies to preparation for surgery, post-injury monitoring, and any changes following inflammation.
At "K+31," a doctor conducts an examination, selects appropriate methods, and explains the results in understandable language. Schedule a consultation if symptoms are interfering with your vision or have appeared suddenly.
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What is a corneal examination and why is it necessary?
The cornea is the transparent front layer of the eye through which light passes into the eye. Changes in its surface can cause blurriness, glare, a gritty sensation, or unstable vision.
A corneal examination helps assess the shape, thickness, transparency, and internal layers of the tissue. The doctor looks for inflammation, scarring, swelling, thinning, and the effects of injury or surgery.
What we evaluate during the examination:
Based on this information, the doctor chooses the next step.