Eagleview Eye Clinic

Tag eye pain

VAN HERRICK TEST

The Van Herrick test is a method used to estimate the depth of the anterior chamber angle in the eye.

What it’s for:

The Van Herrick test is used to:

  1. Assess the risk of angle-closure glaucoma
  2. Evaluate the anterior chamber angle width

How it’s done:

  1. A narrow slit beam is shone onto the peripheral cornea.
  2. The examiner observes the angle between the cornea and iris.
  3. The width of the angle is estimated and graded.

Grading:

The Van Herrick test grades the angle as:

  1. Grade 4: Wide open angle
  2. Grade 3: Moderate angle
  3. Grade 2: Narrow angle
  4. Grade 1: Extremely narrow angle
  5. Grade 0: Closed angle

What it shows:

The test helps identify patients at risk of angle-closure glaucoma, allowing for further evaluation and treatment if necessary.

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.

DUO CHROME TEST

The duochrome test is a subjective refraction technique used in ophthalmology and optometry to refine the spherical endpoint of a patient’s prescription. It works by utilizing the principle of chromatic aberration, where different colors of light are refracted differently by the eye’s optics.

How it works:

  1. Red and Green Filters: The test involves presenting the patient with two colors, typically red and green, which are focused at slightly different points due to chromatic aberration.
  2. Comparing Clarity: The patient is asked to compare the clarity of letters or symbols on both the red and green backgrounds.
  3. Adjusting the Prescription: Based on the patient’s responses, the practitioner adjusts the spherical power to achieve equal clarity between the two colors.

Purpose:

  • Refine Spherical Correction: The duochrome test helps fine-tune the spherical component of a prescription, ensuring the most accurate correction for nearsightedness or farsightedness.
  • Confirm Endpoint: It can confirm the endpoint of a subjective refraction, providing additional assurance in the final prescription.

The duochrome test is a valuable tool in clinical practice, particularly for patients with high visual demands or those requiring precise corrections.

PTERYGIUM EXCISION

Pterygium excision is a surgical procedure to remove a pterygium, a non-cancerous growth on the conjunctiva that can cause irritation, redness, and vision problems. Here’s what you need to know:

Why is it performed?

  • To restore vision by removing the growth
  • To improve cosmetic appearance
  • To relieve chronic irritation and inflammation

Surgical Techniques

  • Simple Excision: A basic method where the pterygium is removed, but it has a higher risk of recurrence (around 10%)
  • P.E.R.F.E.C.T Technique: A more advanced method involving extensive removal of Tenon’s capsule and a conjunctival transplant, with a lower recurrence rate (around 0.1%)
  • Conjunctival Autograft: A technique where a piece of healthy conjunctiva is transplanted to cover the area after pterygium removal
  • Amniotic Membrane Graft: A method using donated amniotic membrane tissue to cover the area after pterygium removal ¹ ²

What to Expect

  • The procedure usually takes less than an hour
  • Local anesthesia is used to numb the eye
  • Post-operative care includes eye drops to prevent infection and inflammation
  • Recovery time can take several weeks

Risks and Complications

  • Infection
  • Recurrence of the pterygium
  • Abnormal scarring
  • Inflammation and irritation

Benefits

  • Effective in removing the pterygium and reducing symptoms
  • Can improve vision and cosmetic appearance
  • Low risk of complications with proper care ³ ⁴
ULTRA THIN LENSES.

Ultra-thin lenses are designed to provide the same functionality as traditional lenses but with a significantly reduced thickness. They’re ideal for individuals with strong prescriptions who want to maintain a stylish appearance without compromising on lens thickness.

Types of Ultra-Thin Lenses:

  • High-Index Lenses: These lenses have a higher refractive index, which allows them to bend light more efficiently, resulting in a thinner design. Examples include 1.74 high-index lenses and 1.76 high-index lenses.
  • Double-Sided Aspheric Lenses: These lenses feature a unique design that reduces distortion and warping, making them thinner and more aesthetically pleasing ¹ ² ³.

Benefits of Ultra-Thin Lenses:

  • Aesthetic Appeal: Ultra-thin lenses are more cosmetically appealing, reducing the “bug-eyed” effect associated with thick lenses.
  • Lightweight: Thinner lenses are lighter, making them more comfortable to wear.
  • Reduced Distortion: Advanced designs minimize distortion and warping, ensuring a clearer field of vision ¹ ².

Recommended For:

  • Strong Prescriptions: Individuals with high myopia or astigmatism can benefit from ultra-thin lenses.
  • Fashion-Conscious Individuals: Those who want stylish glasses without compromising on lens thickness.
  • Individuals with Active Lifestyles: Ultra-thin lenses can be more comfortable and durable ² ¹.

Innovations in Ultra-Thin Lenses:

  • Metalenses: Researchers have developed ultra-thin metalenses that can convert infrared light into visible light, opening up new possibilities for applications in security, authentication, and more ⁴ ⁵.
ULTRA THIN LENSES.

Ultra-thin lenses are designed to provide the same functionality as traditional lenses but with a significantly reduced thickness. They’re ideal for individuals with strong prescriptions who want to maintain a stylish appearance without compromising on lens thickness.

Types of Ultra-Thin Lenses:

  • High-Index Lenses: These lenses have a higher refractive index, which allows them to bend light more efficiently, resulting in a thinner design. Examples include 1.74 high-index lenses and 1.76 high-index lenses.
  • Double-Sided Aspheric Lenses: These lenses feature a unique design that reduces distortion and warping, making them thinner and more aesthetically pleasing ¹ ² ³.

Benefits of Ultra-Thin Lenses:

  • Aesthetic Appeal: Ultra-thin lenses are more cosmetically appealing, reducing the “bug-eyed” effect associated with thick lenses.
  • Lightweight: Thinner lenses are lighter, making them more comfortable to wear.
  • Reduced Distortion: Advanced designs minimize distortion and warping, ensuring a clearer field of vision ¹ ².

Recommended For:

  • Strong Prescriptions: Individuals with high myopia or astigmatism can benefit from ultra-thin lenses.
  • Fashion-Conscious Individuals: Those who want stylish glasses without compromising on lens thickness.
  • Individuals with Active Lifestyles: Ultra-thin lenses can be more comfortable and durable ² ¹.

Innovations in Ultra-Thin Lenses:

  • Metalenses: Researchers have developed ultra-thin metalenses that can convert infrared light into visible light, opening up new possibilities for applications in security, authentication, and more ⁴ ⁵.
ULTRA THIN LENSES.

Ultra-thin lenses are designed to provide the same functionality as traditional lenses but with a significantly reduced thickness. They’re ideal for individuals with strong prescriptions who want to maintain a stylish appearance without compromising on lens thickness.

Types of Ultra-Thin Lenses:

  • High-Index Lenses: These lenses have a higher refractive index, which allows them to bend light more efficiently, resulting in a thinner design. Examples include 1.74 high-index lenses and 1.76 high-index lenses.
  • Double-Sided Aspheric Lenses: These lenses feature a unique design that reduces distortion and warping, making them thinner and more aesthetically pleasing ¹ ² ³.

Benefits of Ultra-Thin Lenses:

  • Aesthetic Appeal: Ultra-thin lenses are more cosmetically appealing, reducing the “bug-eyed” effect associated with thick lenses.
  • Lightweight: Thinner lenses are lighter, making them more comfortable to wear.
  • Reduced Distortion: Advanced designs minimize distortion and warping, ensuring a clearer field of vision ¹ ².

Recommended For:

  • Strong Prescriptions: Individuals with high myopia or astigmatism can benefit from ultra-thin lenses.
  • Fashion-Conscious Individuals: Those who want stylish glasses without compromising on lens thickness.
  • Individuals with Active Lifestyles: Ultra-thin lenses can be more comfortable and durable ² ¹.

Innovations in Ultra-Thin Lenses:

  • Metalenses: Researchers have developed ultra-thin metalenses that can convert infrared light into visible light, opening up new possibilities for applications in security, authentication, and more ⁴ ⁵.
ULTRA THIN LENSES.

Ultra-thin lenses are designed to provide the same functionality as traditional lenses but with a significantly reduced thickness. They’re ideal for individuals with strong prescriptions who want to maintain a stylish appearance without compromising on lens thickness.

Types of Ultra-Thin Lenses:

  • High-Index Lenses: These lenses have a higher refractive index, which allows them to bend light more efficiently, resulting in a thinner design. Examples include 1.74 high-index lenses and 1.76 high-index lenses.
  • Double-Sided Aspheric Lenses: These lenses feature a unique design that reduces distortion and warping, making them thinner and more aesthetically pleasing ¹ ² ³.

Benefits of Ultra-Thin Lenses:

  • Aesthetic Appeal: Ultra-thin lenses are more cosmetically appealing, reducing the “bug-eyed” effect associated with thick lenses.
  • Lightweight: Thinner lenses are lighter, making them more comfortable to wear.
  • Reduced Distortion: Advanced designs minimize distortion and warping, ensuring a clearer field of vision ¹ ².

Recommended For:

  • Strong Prescriptions: Individuals with high myopia or astigmatism can benefit from ultra-thin lenses.
  • Fashion-Conscious Individuals: Those who want stylish glasses without compromising on lens thickness.
  • Individuals with Active Lifestyles: Ultra-thin lenses can be more comfortable and durable ² ¹.

Innovations in Ultra-Thin Lenses:

  • Metalenses: Researchers have developed ultra-thin metalenses that can convert infrared light into visible light, opening up new possibilities for applications in security, authentication, and more ⁴ ⁵.
ULTRA THIN LENSES.

Ultra-thin lenses are designed to provide the same functionality as traditional lenses but with a significantly reduced thickness. They’re ideal for individuals with strong prescriptions who want to maintain a stylish appearance without compromising on lens thickness.

Types of Ultra-Thin Lenses:

  • High-Index Lenses: These lenses have a higher refractive index, which allows them to bend light more efficiently, resulting in a thinner design. Examples include 1.74 high-index lenses and 1.76 high-index lenses.
  • Double-Sided Aspheric Lenses: These lenses feature a unique design that reduces distortion and warping, making them thinner and more aesthetically pleasing ¹ ² ³.

Benefits of Ultra-Thin Lenses:

  • Aesthetic Appeal: Ultra-thin lenses are more cosmetically appealing, reducing the “bug-eyed” effect associated with thick lenses.
  • Lightweight: Thinner lenses are lighter, making them more comfortable to wear.
  • Reduced Distortion: Advanced designs minimize distortion and warping, ensuring a clearer field of vision ¹ ².

Recommended For:

  • Strong Prescriptions: Individuals with high myopia or astigmatism can benefit from ultra-thin lenses.
  • Fashion-Conscious Individuals: Those who want stylish glasses without compromising on lens thickness.
  • Individuals with Active Lifestyles: Ultra-thin lenses can be more comfortable and durable ² ¹.

Innovations in Ultra-Thin Lenses:

  • Metalenses: Researchers have developed ultra-thin metalenses that can convert infrared light into visible light, opening up new possibilities for applications in security, authentication, and more ⁴ ⁵.
ULTRA THIN LENSES.

Ultra-thin lenses are designed to provide the same functionality as traditional lenses but with a significantly reduced thickness. They’re ideal for individuals with strong prescriptions who want to maintain a stylish appearance without compromising on lens thickness.

Types of Ultra-Thin Lenses:

  • High-Index Lenses: These lenses have a higher refractive index, which allows them to bend light more efficiently, resulting in a thinner design. Examples include 1.74 high-index lenses and 1.76 high-index lenses.
  • Double-Sided Aspheric Lenses: These lenses feature a unique design that reduces distortion and warping, making them thinner and more aesthetically pleasing ¹ ² ³.

Benefits of Ultra-Thin Lenses:

  • Aesthetic Appeal: Ultra-thin lenses are more cosmetically appealing, reducing the “bug-eyed” effect associated with thick lenses.
  • Lightweight: Thinner lenses are lighter, making them more comfortable to wear.
  • Reduced Distortion: Advanced designs minimize distortion and warping, ensuring a clearer field of vision ¹ ².

Recommended For:

  • Strong Prescriptions: Individuals with high myopia or astigmatism can benefit from ultra-thin lenses.
  • Fashion-Conscious Individuals: Those who want stylish glasses without compromising on lens thickness.
  • Individuals with Active Lifestyles: Ultra-thin lenses can be more comfortable and durable ² ¹.

Innovations in Ultra-Thin Lenses:

  • Metalenses: Researchers have developed ultra-thin metalenses that can convert infrared light into visible light, opening up new possibilities for applications in security, authentication, and more ⁴ ⁵.