Eagleview Eye Clinic

Tag eye exercises

FLOURESCEIN STAINING

👨‍⚕️ Fluorescein dye is a diagnostic tool used in eye exams. It’s a sterile, orange-tinted solution that highlights corneal defects, scratches, or foreign bodies under blue light.

Key uses:

  1. Corneal abrasions: Stains damaged areas green
  2. Foreign bodies: Helps locate objects
  3. Dry eye assessment: Measures tear breakup time
  4. Contact lens fitting: Evaluates lens fit
  5. Leakage detection: Identifies aqueous humor leaks

Procedure:

  1. Apply anesthetic drops
  2. Place fluorescein strip in eye
  3. Examine under cobalt blue light

Precautions:

  • Temporary discoloration of contact lenses/skin
  • Rare allergic reactions
MIOSIS

Miosis is the constriction of the pupil. It’s the opposite of mydriasis 😊.

Common causes:

  1. Bright light
  2. Medications: Opioids (e.g., morphine), eye drops (e.g., pilocarpine)
  3. Conditions: Horner’s syndrome, iritis, or neurological disorders
  4. Aging
  5. Substance use: Certain drugs (e.g., heroin)

Effects:

  1. Reduced light entry → dim vision in low light
  2. Increased depth of field (improved near vision)
  3. Headache or eye strain
MACULA

The macula is a specialized region at the back of the eye, responsible for central vision and fine detail.

Key functions:

  1. Central vision
  2. Color vision
  3. Fine detail vision

Location:

The macula is located at the center of the retina, including the fovea.

FOVEA CENTRALIS

The fovea centralis is a small pit in the macula of the retina, responsible for sharp central vision.

Key functions:

  1. High-acuity vision
  2. Color vision
  3. Central vision

Importance:

The fovea is crucial for tasks like reading, driving, and recognizing faces.

BROAD H TEST

The Broad H test is used in ophthalmology to assess eye movements.

What it’s for:

The Broad H test is used to assess eye movements in all cardinal positions of gaze.

How it’s done:

  1. The patient is asked to follow a target (like a pen or light) with their eyes.
  2. The target is moved in a broad H shape.
  3. The examiner observes the patient’s eye movements for any limitations or abnormalities as the patient looks up and down, left and right.

What it shows:

The test helps identify:

  1. Limitations in eye movement that can indicate problems with the extraocular muscles or nerves supplying them.
  2. Cranial nerve palsies like III, IV, or VI nerve palsies.
  3. Internuclear ophthalmoplegia (a disorder of eye movements).
  4. Nystagmus (involuntary eye movements) or other abnormal eye movements.

The Broad H test is useful for detecting issues like strabismus or cranial nerve problems. It’s an important part of a comprehensive eye exam.

VERTICAL COINCIDENCE

The vertical coincidence test is a method used in ophthalmology and optometry to assess the alignment of the eyes.

What it’s for:

The vertical coincidence test is used to:

  1. Detect and measure vertical deviations (misalignments) of the eyes
  2. Assess binocular vision and eye alignment
  3. Diagnose and manage conditions like hypertropia (one eye higher than the other) and other vertical strabismus disorders

How it’s performed:

  1. The patient is asked to look at a target, usually a light or an object.
  2. A prism is placed in front of one eye to measure the deviation.
  3. The prism is adjusted until the two images seen by the patient appear to be vertically coincident (aligned).
  4. The amount of prism required to achieve alignment is a measure of the vertical deviation.

What it shows:

The test shows the amount of vertical misalignment between the two eyes, helping diagnose conditions like:

  1. Hypertropia (one eye higher than the other)
  2. Hypotropia (one eye lower than the other)
  3. Other vertical strabismus disorders

The vertical coincidence test provides valuable information about eye alignment and helps diagnose and manage vertical strabismus. If you have more questions or need further clarification, feel free to ask.

WORTH 4 DOT TEST

The Worth 4-Dot test is a clinical test used in ophthalmology and orthoptics to assess binocular vision and detect suppression or anomalies in binocular vision.

Key Features:

  1. Four dots: The test involves four dots or lights, typically arranged in a square or diamond pattern.
  2. Color filters: The patient wears red-green glasses or filters, with one eye seeing two dots (or lights) and the other eye seeing the other two.
  3. Binocular fusion: The test assesses the patient’s ability to fuse the images from both eyes.

Purpose:

The Worth 4-Dot test is used to:

  1. Assess binocular vision: Evaluate the patient’s ability to combine images from both eyes.
  2. Detect suppression: Identify suppression or anomalies in binocular vision, which can indicate conditions like strabismus or amblyopia.
  3. Monitor treatment: Track changes in binocular vision during treatment or therapy.

How it works:

  1. Patient views the dots: The patient looks at the four dots or lights through the red-green glasses.
  2. Response evaluation: The practitioner evaluates the patient’s response, noting whether they see four dots (indicating binocular fusion), two dots (indicating suppression), or some other pattern.

The Worth 4-Dot test provides valuable information about binocular vision and can help diagnose and manage various vision disorders.

ASTIGMATIC FAN DIAL

An astigmatic fan dial, also known as a fan dial or astigmatic dial, is a tool used in ophthalmology and optometry for detecting and measuring astigmatism. Here’s a more detailed description:

Key Features:

  1. Radial lines: The dial consists of multiple radial lines, often in a fan-like or dial shape, with lines spaced at regular intervals (usually 10-15 degrees).
  2. Rotating dial: The dial can be rotated to different positions, allowing the practitioner to determine the axis of astigmatism.
  3. Measurement markings: The dial typically has measurement markings or degree indicators to record the axis of astigmatism.

How it works:

  1. Patient views the dial: The patient views the fan dial through a phoropter or trial frame, often with corrective lenses in place.
  2. Determine astigmatism axis: The practitioner rotates the dial while asking the patient to identify the orientation of the lines that appear clearest or most distinct.
  3. Measure astigmatism: By determining the axis of the clearest lines, the practitioner can estimate the axis of astigmatism and prescribe corrective lenses accordingly.

Purpose:

The astigmatic fan dial is used to:

  1. Detect astigmatism: Identify the presence and amount of astigmatism in a patient’s eye.
  2. Measure astigmatism: Determine the axis and amount of astigmatism to prescribe corrective lenses.
  3. Refine prescriptions: Fine-tune prescriptions for patients with astigmatism.

The astigmatic fan dial is a useful tool in ophthalmology and optometry for diagnosing and correcting astigmatism, helping practitioners provide accurate and effective treatment.

ASTIGMATIC FAN DIAL

An astigmatic fan dial, also known as a fan dial or astigmatic dial, is a tool used in ophthalmology and optometry for detecting and measuring astigmatism. Here’s a more detailed description:

Key Features:

  1. Radial lines: The dial consists of multiple radial lines, often in a fan-like or dial shape, with lines spaced at regular intervals (usually 10-15 degrees).
  2. Rotating dial: The dial can be rotated to different positions, allowing the practitioner to determine the axis of astigmatism.
  3. Measurement markings: The dial typically has measurement markings or degree indicators to record the axis of astigmatism.

How it works:

  1. Patient views the dial: The patient views the fan dial through a phoropter or trial frame, often with corrective lenses in place.
  2. Determine astigmatism axis: The practitioner rotates the dial while asking the patient to identify the orientation of the lines that appear clearest or most distinct.
  3. Measure astigmatism: By determining the axis of the clearest lines, the practitioner can estimate the axis of astigmatism and prescribe corrective lenses accordingly.

Purpose:

The astigmatic fan dial is used to:

  1. Detect astigmatism: Identify the presence and amount of astigmatism in a patient’s eye.
  2. Measure astigmatism: Determine the axis and amount of astigmatism to prescribe corrective lenses.
  3. Refine prescriptions: Fine-tune prescriptions for patients with astigmatism.

The astigmatic fan dial is a useful tool in ophthalmology and optometry for diagnosing and correcting astigmatism, helping practitioners provide accurate and effective treatment.

TRIAL LENS SET

A trial lens set is a collection of lenses used to determine the correct prescription for eyeglasses or contact lenses. These sets typically include a variety of lenses with different powers and types, such as spherical, cylindrical, and prismatic lenses.

Types of Trial Lens Sets:

  • Full-aperture trial lens sets: These sets have lenses with full apertures, allowing for unobstructed vision during exams. They often come in metal or plastic rims and may include accessory lenses.
  • Compact trial lens sets: These sets are designed to be more portable and space-efficient, making them ideal for mobile practitioners or small clinics ¹ ².

Features to Consider:

  • Lens material: Glass or high-quality plastic lenses ensure accurate and reliable results.
  • Rim material: Metal rims are durable, while plastic rims are lighter and more resistant to corrosion.
  • Number of lenses: Sets can range from a few dozen to several hundred lenses, depending on the intended use and practitioner preference.
  • Accessory lenses: Some sets include additional lenses, such as prism lenses, Maddox lenses, or occluders, to facilitate more comprehensive eye exams ¹ ² ³.

Popular Brands:

  • Veatch Ophthalmic Instruments: Known for their high-quality, full-aperture trial lens sets with metal rims.
  • Rexxam: Offers trial lens sets with plastic or metal rims, along with robust trial frames.
  • UCanSee: Provides affordable trial lens sets with high-quality lenses and durable cases.
  • Keeler: A well-established brand in the ophthalmic industry, offering trial lens sets and frames