Eagleview Eye Clinic

Tag eye diseases

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.

MONOFOCAL IOL

A monofocal IOL 👀 is a type of intraocular lens that focuses at one distance (near, intermediate, or far).

Key things

  • Single focus point: Usually set for distance vision (you’d use glasses for near tasks like reading).
  • Less dependence on glasses if monovision approach is used (e.g., one eye for distance, one for near).
  • Common and reliable: Predictable outcomes, often covered by insurance.

Pros

  • Sharp vision at chosen distance.
  • Lower risk of visual side effects (e.g., halos, glare) vs multifocal IOLs.

Cons

  • Glasses needed for other distances (unless monovision).
  • Less flexibility compared to multifocal/accommodating IOLs.

INTRAOCULAR LENS

An intraocular lens (IOL) 👓 is an artificial lens implanted in the eye to replace the natural lens, usually during cataract surgery or refractive lens exchange.

Types

  • Monofocal IOLs: Focus at one distance (near, intermediate, or far).
  • Multifocal IOLs: Allow focus at multiple distances (e.g., near and far).
  • Accommodating IOLs: Move with eye muscles to focus.
  • Toric IOLs: Correct astigmatism.

Benefits

  • Vision restoration: Improves clarity after cataract removal.
  • Reduced dependence on glasses: Depending on IOL type.
  • Customizable: Chosen based on lifestyle and needs.

B – SCAN

A B-scan ultrasound 👀 is a diagnostic test that uses sound waves to create images of the eye’s internal structures, especially the posterior segment.

Key uses

  • Retinal detachment: Shows if the retina is detached or torn.
  • Vitreous hemorrhage: Visualizes blood in the vitreous.
  • Tumors: Helps identify and measure eye tumors.
  • Foreign bodies: Locates objects inside the eye.
  • Trauma assessment: Evaluates damage when the eye’s hard to examine.

How it works

  1. Probe placement: Gel is applied; the probe is placed on the eyelid (closed or open).
  2. Sound waves: Echoes bounce off structures, creating images.
  3. Interpretation: Images show structures like the retina, vitreous, and orbit.

Types of scans

  • Axial scan: Shows structures along the eye’s axis.
  • Longitudinal scan: Images are taken in different meridians.

Tips

  • Painless and non-invasive.
  • Coupling gel is used for better contact.
  • Results are immediate.

MIRROR TEST

The mirror test 🪞 is a sneaky way to check if someone’s faking vision loss in one eye (malingering).

How it works

  1. Patient claims blindness in one eye.
  2. Place a mirror in front of them, angled to show their “blind” eye.
  3. Ask them to look straight ahead.
  4. Check if they react to their own reflection (e.g., blink, move, etc.).

What it shows

  • If they react to their reflection, it suggests the “blind” eye can see.
  • If they don’t react, could be malingering… or really blind 😅.

Tips

  • Casual setup: Make it seem like a normal exam step.
  • Distract them: Talk about something else while doing the test.
  • Combine with other tests for stronger evidence.