How to check corneal thickness
In recent years, with the popularity of myopia surgery and eye health examinations, the measurement of corneal thickness has become the focus of many people's attention. Corneal thickness not only affects the feasibility of vision correction surgery, but is also closely related to a variety of eye diseases. This article will introduce in detail the corneal thickness examination method, normal range and related precautions, and attach structured data so that readers can quickly obtain key information.
1. How to check corneal thickness
The measurement of corneal thickness is usually done with professional ophthalmic equipment. The following are some common examination methods:
| Check method | Principle | Applicable scenarios |
|---|---|---|
| Ultrasonic corneal pachymeter | Measuring corneal thickness using the principle of ultrasonic reflection | Preoperative examination and routine eye examination |
| corneal topograph | Obtain corneal curvature and thickness data through optical scanning | Myopia surgical evaluation, keratoconus screening |
| Anterior Segment OCT (Optical Coherence Tomography) | High-resolution imaging technology measures the thickness of each corneal layer | Precision diagnosis and scientific research purposes |
2. Normal range of corneal thickness
The corneal thickness of healthy adults is usually within the following range, but individual differences are large and need to be combined with clinical evaluation:
| cornea area | Normal thickness range (microns) |
|---|---|
| central cornea | 520-550 |
| peripheral cornea | 600-700 |
3. Clinical significance of abnormal corneal thickness
A cornea that is too thin or too thick may indicate the following problems:
| abnormal situation | May be associated with diseases |
|---|---|
| Cornea is too thin (<500μm) | Keratoconus, postoperative corneal ectasia |
| Cornea is too thick (>600μm central area) | Corneal edema, Fuchs endothelial dystrophy |
4. Inspection precautions
1.Preoperative preparation:People who wear contact lenses need to stop wearing them (at least 3 days for soft lenses and 2 weeks for hard lenses).
2.Checking process:The non-contact examination is painless, and ultrasound examinations may require topical anesthesia.
3.Interpretation of the report:Comprehensive judgment needs to be made by a professional ophthalmologist combined with other examination results.
5. Popular questions and answers
Q: Can abnormalities in corneal thickness be detected through ordinary vision examination?
A: No, it must be measured with professional equipment.
Q: Is it true that if the cornea is thin, one cannot undergo laser surgery?
A: It is not absolute, but the remaining safe corneal thickness needs to be carefully evaluated.
Summary:Corneal thickness examination is an important part of eye health assessment. Regular monitoring is recommended for people who need surgery or are at high risk (such as those with high myopia). Choose a regular medical institution and follow the doctor’s instructions for personalized management.
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