Name of the Procedure:

Ophthalmic biometry by partial coherence interferometry with intraocular lens power calculation.
Common name(s): Optical Biometry, PCI Biometry, Lens Power Calculation.

Summary

Optical biometry is a non-invasive eye examination that uses light waves to measure the eye's structure. The procedure helps determine the correct power of an intraocular lens (IOL) that will be implanted during cataract surgery.

Purpose

The purpose of this procedure is to accurately measure the eye's dimensions, ensuring precisely calculated IOL power. This improves visual outcomes for patients undergoing cataract surgery.

Indications

• Presence of cataracts impairing vision
• Preoperative assessment for IOL implantation
• Patients with refractive errors who need precision in IOL power calculation

Preparation

• No fasting required.
• Patients should avoid wearing contact lenses for a designated period before the test, as advised by the healthcare provider.
• No special medication adjustments usually needed.
• Basic eye examination may be done prior.

Procedure Description

1. The patient sits and places their chin on a chin rest.
2. The eye is aligned with the biometry device.
3. Light waves are projected into the eye, measured as they reflect back.
4. The device captures and analyzes data on the eye’s length, corneal curvature, and anterior chamber depth.
5. Results are used to calculate the ideal IOL power.
6. No sedation or anesthesia is usually required.

Duration

The procedure typically takes about 5 to 10 minutes.

Setting

Performed in an ophthalmologist's office, outpatient clinic, or hospital eye department.

Personnel

• Ophthalmologist
• Ophthalmic technician or nurse

Risks and Complications

• Minimal to no risks involved.
• Rarely, patients may need repeated measurements if initial results are inconsistent.

Benefits

• Accurate measurement of eye dimensions.
• Enhanced precision in IOL power calculation leading to better vision post-cataract surgery.
• Non-invasive and painless.

Recovery

• No recovery time needed.
• Patients can return to normal activities immediately after the procedure.
• Follow any additional instructions provided by the eye care professional regarding cataract surgery preparation.

Alternatives

• Ultrasound biometry: Uses sound waves instead of light; effective but less accurate.
  • Pros: Widely available, effective for eyes with dense cataracts.
  • Cons: Less precise than optical biometry, slightly discomforting.
• Manual IOL power estimation: Based on standard calculations without precise measurement tools.
  • Pros: Quick, no technology needed.
  • Cons: Less accurate, potential for suboptimal visual outcomes.

Patient Experience

• The patient will feel no pain during the procedure.
• The light waves used are invisible and harmless.
• Patients can expect a simple, quick, and comfortable experience.
• There are no lingering effects, and normal activities can be resumed right away.