After a corneal foreign body is removed, you’ll typically use antibiotic eye drops to prevent infection, and maybe lubricating drops for comfort. Avoid rubbing your eye, wear sunglasses if light-sensitive, and don’t wear contacts until it’s healed. Most people feel better in 24–48 hours, but if pain, redness, or blurry vision gets worse, see your eye doctor ASAP.
CORNEA FOREIGN BODY REMOVAL
Corneal foreign body removal is a common eye procedure done when something like dust, metal, or sand gets stuck on the cornea. Here’s how it’s typically done:
- Assessment: Doctor checks eye with a slit lamp to locate and evaluate the foreign body.
- Anesthetic drops: Numbing eye drops are applied for comfort.
- Removal: Using a sterile needle, burr, or cotton swab, the doctor gently lifts out the foreign object.
- Post-care: Antibiotic eye drops or ointment are prescribed to prevent infection.
- Follow-up: Healing usually happens within 24-48 hours; pain and redness should improve quickly.
CORNEA FOREIGN BODY
Corneal foreign body: small object (metal, dust, sand) stuck on eye surface. Causes pain, redness, tearing, blurry vision, and gritty feeling. Doctor removes it with slit lamp and tiny needle or swab. After removal, antibiotic drops prevent infection, and eye heals fast—usually 24–48 hrs.
OCULAR FITNESS REPORT
An ocular fitness report checks if your eyes meet health and vision standards for work, school, or driving. It includes:
- Name, age, gender, ID
- Visual acuity (distance/near, with/without glasses)
- Refraction (need for glasses/contact lenses)
- Color vision (Ishihara test or similar)
- Eye health exam (check for infections, cataract, glaucoma, retinal issues)
- Conclusion: “Fit,” “Fit with corrective lenses,” or “Not fit” with reason.
a WAVE and b WAVE
A-waves and B-waves are key components of the full-field ERG, reflecting retinal function:
- A-wave: Initial negative deflection, generated by photoreceptors (rods and cones) responding to light. Its amplitude and timing indicate photoreceptor health.
- B-wave: Positive deflection following A-wave, produced by inner retinal cells (bipolar and Müller cells). It shows how well signals from photoreceptors are processed.
Reduced A-waves suggest photoreceptor damage (e.g., retinitis pigmentosa), while reduced B-waves point to inner retinal issues (e.g., retinal vascular diseases).
P50 and N95
P50 and N95 are key waves in pattern ERG (PERG), reflecting retinal ganglion cell (RGC) function:
- P50: Early positive wave, mainly from RGCs and inner retinal layers. Reduced amplitude or delayed timing suggests ganglion cell dysfunction, common in early glaucoma or optic neuropathies.
- N95: Later negative wave, more specific to optic nerve health. A drop in N95 amplitude often signals optic nerve damage or axonal loss.
Both waves together help gauge severity and progression of optic nerve diseases. For example, in glaucoma, P50 might reduce first, then N95 drops as damage worsens.
PATTERN ERG
Pattern ERG (PERG) measures electrical activity from retinal ganglion cells in response to a reversing checkerboard pattern. It’s great for spotting optic nerve issues like glaucoma and macular problems.
- How it’s done: Electrodes on the eye, patient looks at a screen with a checkerboard pattern that flips contrast.
- What it records: P50 wave (early positive) reflects ganglion cell function; N95 wave (negative) relates to optic nerve health.
- Key use: Detects ganglion cell loss early, even before visual field defects show up.
- Difference from full-field ERG: PERG focuses on central retina and optic nerve, not whole retinal response.
FULL ERG
Full-field ERG tests the entire retina’s electrical response to light. You get electrodes on the cornea or skin, dark-adapt for ~20 mins, then flashes of light stimulate rods and cones. It records a-waves (photoreceptor activity) and b-waves (inner retinal response). Used to diagnose widespread retinal diseases like retinitis pigmentosa or Leber congenital amaurosis. Results show overall retinal function, not localized areas.
ELECTRORETINOGRAPHY
Electroretinography (ERG) is a test that measures the electrical response of the retina’s light-sensitive cells (rods and cones) to light stimuli. It helps diagnose retinal diseases like retinitis pigmentosa, macular degeneration, and Leber congenital amaurosis.
- How it works: Electrodes placed on the cornea or skin around the eye record electrical activity while the eye is exposed to flashes of light.
- What it shows: Waves (a-waves, b-waves) reflecting function of photoreceptors and inner retinal layers.
- Types: Full-field ERG (tests whole retina), multifocal ERG (tests small areas), and pattern ERG (tests ganglion cells).
- Use: Detects retinal dysfunction even before vision loss is noticeable.
GENE THERAPY
Gene therapy for Leber congenital amaurosis (LCA) delivers a functional copy of a mutated gene to retinal cells, usually using an adeno-associated virus (AAV) vector injected under the retina. The first FDA-approved treatment, Luxturna, targets RPE65 mutations and has shown improved night vision and visual fields in many patients.
- Process: A tiny surgical incision allows subretinal injection of the viral vector carrying the healthy gene.
- Outcome: Can restore some visual function, especially in dim light, but not full sight.
- Limitations: Effective only for certain mutations; benefits vary, and it’s not a cure.
- Risks: Includes inflammation, retinal detachment, or increased eye pressure.
- Research: Ongoing trials for other genes like CEP290 and GUCY2D.