The Partially Sighted Society Learning Zone

How to use a high powered hand magnifier.

By PSSOptomPosted on Posted in magnifiersTagged , ,

Demonstrating how to use a high powered hand magnifier

Today’s video is showing how to use a high power hand magnifier with low vision.

Bringing the magnifier close to the best vision eye is the equivalent of looking through a key hole… You would want to get close to the keyhole to see more of what is behind the door.

Check oout our FAQ on low vision

A

Prisms in spectacles

How do Prisms help i spectacles

Prisms in spectacles
Category: Stroke


Prisms in spectacles work like gentle tilts, redirecting light rays to the correct spot on the retina. This helps misaligned eyes see a single, clear image.

Correcting misalignment of the eyes: When the eyes are misaligned, the light rays from an object strike different spots on the retinas of each eye. This can cause double vision, blurred vision, and headaches, making it difficult to read comfortably. Prisms bend the light rays so that they fall on the same spot on each retina, allowing the brain to fuse the two images into a single, clear image. This can significantly improve reading comfort and clarity.

How do prisms help with strokes?

Yoke prisms are a type of prism used in vision therapy to help stroke patients with visual impairments, such as homonymous hemianopia (loss of vision in one half of the visual field) and unilateral spatial neglect (difficulty paying attention to one side of the body or environment).

Think of yoke prisms as special glasses that create a slight shift in the visual field. When stroke patients wear yoke prisms, they gradually adapt to this shift, causing the brain to rewire its visual processing pathways. This rewiring can help expand the visual field, improve attention to the neglected side, and enhance overall visual perception.

Imagine a patient with homonymous hemianopia who struggles to see objects on their left side. Yoke prisms can gently nudge the visual field to the right, allowing the patient to perceive objects they previously missed. This expansion of the visual field can significantly improve their daily activities, such as walking, eating, and dressing.

Similarly, for patients with unilateral spatial neglect, yoke prisms can help them recognize and attend to the neglected side. By shifting the visual field, they become more aware of their surroundings and can better navigate their environment.

Yoke prism therapy is typically prescribed by an optometrist or neuro-ophthalmologist and involves wearing the prisms for several hours each day. The therapy may continue for several weeks or months, depending on the patient’s progress.

In summary, yoke prisms help stroke patients by:

  1. Expanding the visual field for those with homonymous hemianopia
  2. Improving attention to the neglected side for those with unilateral spatial neglect
  3. Enhancing overall visual perception and spatial awareness
  4. Promoting brain plasticity and rewiring of visual processing pathways

#mp_form_popup1 .mailpoet_form { } #mp_form_popup1 form { margin-bottom: 0; } #mp_form_popup1 p.mailpoet_form_paragraph { margin-bottom: 10px; } #mp_form_popup1 .mailpoet_column_with_background { padding: 10px; } #mp_form_popup1 .mailpoet_form_column:not(:first-child) { margin-left: 20px; } #mp_form_popup1 .mailpoet_paragraph { line-height: 20px; margin-bottom: 20px; } #mp_form_popup1 .mailpoet_segment_label, #mp_form_popup1 .mailpoet_text_label, #mp_form_popup1 .mailpoet_textarea_label, #mp_form_popup1 .mailpoet_select_label, #mp_form_popup1 .mailpoet_radio_label, #mp_form_popup1 .mailpoet_checkbox_label, #mp_form_popup1 .mailpoet_list_label, #mp_form_popup1 .mailpoet_date_label { display: block; font-weight: normal; } #mp_form_popup1 .mailpoet_text, #mp_form_popup1 .mailpoet_textarea, #mp_form_popup1 .mailpoet_select, #mp_form_popup1 .mailpoet_date_month, #mp_form_popup1 .mailpoet_date_day, #mp_form_popup1 .mailpoet_date_year, #mp_form_popup1 .mailpoet_date { display: block; } #mp_form_popup1 .mailpoet_text, #mp_form_popup1 .mailpoet_textarea { width: 200px; } #mp_form_popup1 .mailpoet_checkbox { } #mp_form_popup1 .mailpoet_submit { } #mp_form_popup1 .mailpoet_divider { } #mp_form_popup1 .mailpoet_message { } #mp_form_popup1 .mailpoet_form_loading { width: 30px; text-align: center; line-height: normal; } #mp_form_popup1 .mailpoet_form_loading > span { width: 5px; height: 5px; background-color: #5b5b5b; } #mp_form_popup1 h2.mailpoet-heading { margin: 0 0 20px 0; } #mp_form_popup1 h1.mailpoet-heading { margin: 0 0 10px; }#mp_form_popup1{border: 0px solid #abb8c3;border-radius: 28px;text-align: center;}#mp_form_popup1{width: 380px;max-width: 100vw;}#mp_form_popup1 .mailpoet_message {margin: 0; padding: 0 20px;} #mp_form_popup1 .mailpoet_validate_success {color: #00d084} #mp_form_popup1 input.parsley-success {color: #00d084} #mp_form_popup1 select.parsley-success {color: #00d084} #mp_form_popup1 textarea.parsley-success {color: #00d084} #mp_form_popup1 .mailpoet_validate_error {color: #cf2e2e} #mp_form_popup1 input.parsley-error {color: #cf2e2e} #mp_form_popup1 select.parsley-error {color: #cf2e2e} #mp_form_popup1 textarea.textarea.parsley-error {color: #cf2e2e} #mp_form_popup1 .parsley-errors-list {color: #cf2e2e} #mp_form_popup1 .parsley-required {color: #cf2e2e} #mp_form_popup1 .parsley-custom-error-message {color: #cf2e2e} #mp_form_popup1 .mailpoet_paragraph.last {margin-bottom: 0} @media (max-width: 500px) {#mp_form_popup1 {background-image: none;animation: none;border: none;border-radius: 0;bottom: 0;left: 0;max-height: 40%;padding: 20px;right: 0;top: auto;transform: none;width: 100%;min-width: 100%;}} @media (min-width: 500px) {#mp_form_popup1 {padding: 25px;}} @media (min-width: 500px) {#mp_form_popup1 .last .mailpoet_paragraph:last-child {margin-bottom: 0}} @media (max-width: 500px) {#mp_form_popup1 .mailpoet_form_column:last-child .mailpoet_paragraph:last-child {margin-bottom: 0}}
Hi Pleased to meet you. Feel free to sign up to our Newsletter

Oh hi there 👋
It’s nice to meet you.

Sign up to receive The PSS Learning Zone content in your inbox.

We don’t spam! Read our privacy policy for more info.

Check your inbox or spam folder to confirm your subscription.

Prisms in spectacles
Posted on 24/11/2023
Tags: binocular instability, convergence, Prisms
Permalink
Back to Top
How to use a high powered hand magnifier.
Scroll to top