Investigation

Investigation service at Nava Drisiti  eye hospital provides specialized eye investigations.

Service Description

1. Optical Coherence Tomography (OCT)

• • Description: A non-invasive imaging method that uses light waves to take cross-sectional, 3D images of the retina and optic nerve. It is often compared to an ultrasound but uses light instead of sound, providing high-resolution views of each retinal layer.

2. Fundus Photography / Retinal Imaging

• • Description: Creates high-quality digital images of the back of the eye, including the retina, macula, and optic nerve.

3. Fluorescein Angiography (FA)

• • Description: An imaging test that uses a fluorescent dye to highlight blood vessels in the retina.

4. Ocular Ultrasound (A-scan/B-scan) 

• • Description: Uses high-frequency sound waves to capture images of the inside of the eye.

5. Corneal Topography

• • Description: A mapping technique used to analyze the surface curvature of the cornea (the outer structure of the eye).

6. OCT Angiography (OCTA)

• • Description: A newer, non-invasive imaging method that maps blood flow in the retina and choroid.

7. Automated Visual Field (AVF)

• • Description: An Automated Visual Field (AVF) test, also known as automated perimetry, is a computer-driven diagnostic tool used to measure the full extent of your peripheral (side) and central vision 

8. Dry Eye

• • Description: Dry eye testing involves a comprehensive exam to measure tear quantity and quality.  
  • Frequently asked question and its answer

• • • Do I need to fast before my eye scan?
      • No, fasting is not required for most eye imaging tests.
    • Will the tests hurt?
      • Most imaging tests, such as OCT, are non-contact, painless, and take only a few minutes.
    • Will I need my eyes dilated?
      • Many imaging tests require pupil dilation to get a clear view of the retina. This can make vision blurry and light-sensitive for 4–6 hours afterwards.
    • Can I drive after the test?
      • If your eyes are dilated, you should arrange for someone else to drive you home.

Optical Coherence Tomography (OCT) Scan 

• What is an OCT scan?
  • It is a non-invasive scan that uses light waves to capture detailed, cross-sectional, 3D images of the retina and optic nerve.
• Why do I need an OCT?
  • It is used to detect early signs of eye diseases like glaucoma, macular degeneration, and diabetic retinopathy.
• How often should I have an OCT?
  • While recommended yearly for high-risk individuals (e.g., diabetics, aged 50+), your doctor will determine the appropriate interval.
• How long does it take? T
  • he scan itself takes only a few minutes (5–10 minutes). 

Fluorescein Angiography (FA/FFA)

• What is Fluorescein Angiography?
  • A test where a fluorescent dye is injected into a vein (usually the arm) to highlight blood vessels in the retina for imaging.
• What does the dye do?
  • The dye highlights damaged or leaking blood vessels. It is normal for skin and urine to appear yellow/orange for 24 hours afterward.
• Are there side effects?
  • Some patients experience mild nausea or a metallic taste in the mouth for a few minutes.
• Why do I need this test?
  • It is essential for diagnosing diabetic retinopathy, macular edema, or retinal vein occlusion. 

Other Common Eye Imaging Tests

• What is a Fundus Photo?
  • A specialized camera takes high-resolution pictures of the back of the eye (retina) to document and monitor diseases.
• What is a Corneal Topography?
  • A non-contact, computerized test that generates a 3D map of the surface of the cornea to diagnose conditions like astigmatism or keratoconus.
• What is an A-Scan Biometry?
  • A test that uses ultrasound to measure the length of the eye, typically done to determine the correct lens power for cataract surgery.
• What is a Visual Field Test?
  • A test that measures your peripheral (side) vision to check for blind spots, commonly used to monitor glaucoma. 

Preparation and Post-Test Care

• What should I bring?
  • Bring your glasses, contact lenses, a list of current medications, and sunglasses.
• Can I wear makeup?
  • It is often recommended to avoid eye makeup, as it can interfere with imaging.
• How long do results take?
  • Results are sometimes available immediately, but often they require analysis and will be discussed at a follow-up appointment.