Eagleview Eye Clinic

Category Eye Health Education

CORNEA NEOVASCULARIZATION

👓 Corneal neovascularization is the growth of new blood vessels into the cornea, typically as a response to injury, infection, or hypoxia.

  • Causes: Contact lens wear, infections (e.g., herpes simplex keratitis), trauma, or inflammation.
  • Effects: Can lead to vision impairment, scarring, or lipid deposition.
  • Symptoms: May cause redness, discomfort, or vision changes.
  • Management: Treats underlying cause, steroids, or anti-VEGF therapy in some cases.

CONDITIONS THAT CAN OCCUR FROM CONTACT LENS USE

😊 Contact lens misuse can lead to various eye issues, including:

  • Infections: Bacterial (e.g., bacterial keratitis), fungal, or viral (e.g., adenovirus).
  • Irritation and allergies: Giant papillary conjunctivitis (GPC), allergic reactions to lens solutions.
  • Corneal issues: Abrasions, ulcers, neovascularization, or dellen.
  • Hypoxia-related problems: Corneal edema, neovascularization.
  • Other: Dry eye, discomfort, or lens-related complications.

CORNEA DELLEN

👓 Corneal dellen (or dellen) refers to a localized thinning or depression in the peripheral cornea.

  • Causes: Often due to localized dehydration or inflammation, sometimes related to:
    • Contact lens use
    • Surgery or trauma
    • Adjacent lesions (e.g., pterygium)
  • Symptoms: May cause discomfort, irritation, or blurred vision.
  • Management: Often resolves with lubrication, discontinuing contact lens use, or treating underlying causes.

MORNING GLORY SYNDROME

👓 Morning glory syndrome is a rare congenital eye anomaly characterized by an abnormal optic disc.

  • Appearance: The optic disc looks like a morning glory flower, with a funnel-shaped excavation and radial retinal vessels.
  • Associated risks: Potential vision problems, retinal detachment, and other eye issues.
  • Causes: Congenital, possibly related to abnormal fetal development.
  • Management: Regular eye exams, monitoring for complications.
AIR PUFF TONOMETER

👓 The air puff tonometer is a non-contact device that measures intraocular pressure (IOP) by blowing a quick puff of air onto the cornea.

  • How it works: The device measures the corneal deformation caused by the air puff.
  • Advantages: No direct contact with the eye, reducing infection risk.
  • Common use: Often used for glaucoma screening and routine eye exams.
  • Considerations: Can be less accurate than contact tonometers (e.g., Goldmann).

TONOPEN TONOMETER

👓 To open a Perkins tonometer (for maintenance or calibration), you typically need to:

  1. Check the manual: Consult the manufacturer’s instructions for specific guidance.
  2. Handle with care: Tonometers are sensitive instruments.
  3. Common steps: Usually involves removing screws or a cover to access the internal mechanism.

If you’re looking to use the tonometer, ensure it’s properly calibrated and sterilized before measuring IOP.

PERKINS TONOMETER

👓 The Perkins tonometer is a handheld, portable device used to measure intraocular pressure (IOP).

  • Type: Applanation tonometer, similar to Goldmann tonometer.
  • Use: Commonly used in ophthalmology and optometry for glaucoma screening and monitoring.
  • How it works: Uses a small probe to gently touch the cornea, measuring IOP.
  • Advantages: Portable, easy to use, and provides accurate readings.

GOLDMAN APPLANATION TONOMETER

👓 The Goldmann tonometer is a widely used device for measuring intraocular pressure (IOP).

  • How it works: Uses a small probe to gently touch the cornea, measuring the force needed to flatten a small area.
  • Gold standard: Considered the gold standard for IOP measurement.
  • Common use: Routine eye exams, glaucoma diagnosis, and monitoring.
  • Requires anesthetic: Typically uses topical anesthetic eye drops.

20D LENS

👓 Here’s more on a 20D lens:

  • Magnification: A +20D lens provides approximately 20x magnification.
  • Field of view: Offers a relatively wide field, useful for examining the retina.
  • Use: Commonly used in ophthalmology for:
    • Indirect ophthalmoscopy (with a slit lamp or head-mounted scope).
    • Examining the posterior segment (retina, macula, etc.).
  • Type: Typically a handheld, convex lens made of glass or acrylic.
  • Working distance: Around 5 cm (2 inches) from the patient’s eye.
BIFOCAL IOL

👓 Bifocal IOLs (Intraocular Lenses) are a type of lens implant used in cataract surgery to help restore vision at multiple distances. They’re designed to reduce dependence on glasses or contacts.

  • How they work: Bifocal IOLs have different zones for near and distance vision, allowing for clearer vision at multiple distances.
  • Types: Some common types include diffractive (e.g., Alcon ReSTOR) and refractive (e.g., AMO Array) lenses.
  • Benefits: Reduced need for glasses, improved vision at various distances.
  • Considerations: Potential for halos, glare, or decreased contrast sensitivity.