Presentation is loading. Please wait.

Presentation is loading. Please wait.

Convex-lens aids. A: Spectacle magnifiers

Published byGriffin Jefferson Modified over 6 years ago

Similar presentations

Presentation on theme: "Convex-lens aids. A: Spectacle magnifiers"— Presentation transcript:

1 Convex-lens aids. A: Spectacle magnifiers
Convex-lens aids. A: Spectacle magnifiers. B: Spectacle-mounted magnifiers. C: High-power reading spectacles with prisms to reduce the requirement for convergence. D and E: Dome magnifiers. F: Hand magnifiers of various strengths. G: Hand magnifier in use. H: Hand magnifiers suitable for carrying in a pocket or purse. I: Illuminated hand magnifiers of various strengths. J–L: Illuminated hand magnifiers with LED blue, green, and yellow light. M: Fixed focus stand magnifier, allowing writing on the material being read. Source: Low Vision, Vaughan & Asbury's General Ophthalmology, 19e Citation: Riordan-Eva P, Augsburger JJ. Vaughan & Asbury's General Ophthalmology, 19e; 2017 Available at: Accessed: November 12, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved

Download ppt "Convex-lens aids. A: Spectacle magnifiers"

Similar presentations

(c) McGraw Hill Ryerson 2007 5.3 Using Lenses to Form Images A lens is a piece of transparent material that can bend, or refract, light rays in useful.

(c) McGraw Hill Ryerson Using Lenses to Form Images A lens is a piece of transparent material that can bend, or refract, light rays in useful.
(c) McGraw Hill Ryerson 2007 3.5 Extending Human Vision Microscopes A compound light microscope uses two convex lenses to magnify small, close objects.

(c) McGraw Hill Ryerson Extending Human Vision Microscopes A compound light microscope uses two convex lenses to magnify small, close objects.
Extending Human Vision. Microscopes (c) McGraw Hill Ryerson 2007  A compound light microscope uses two convex lenses to magnify small, close objects.

Extending Human Vision. Microscopes (c) McGraw Hill Ryerson 2007  A compound light microscope uses two convex lenses to magnify small, close objects.
Copyright© SANYO Electric Co., Ltd. All Rights Reserved 2008 1 3LCD Optical Engine Technology New 4LCD Optical Engine Technology Lens Prism New LCD Panel.

Copyright© SANYO Electric Co., Ltd. All Rights Reserved LCD Optical Engine Technology New 4LCD Optical Engine Technology Lens Prism New LCD Panel.
Illustration of how the diagnostic yield changes as the size of the gene panel (number of genes) increases. The general characteristics of panels of various.

Illustration of how the diagnostic yield changes as the size of the gene panel (number of genes) increases. The general characteristics of panels of various.
Lumbar spondylosis with degeneration of the disc and facet joint, leading to narrowing of the spinal canal and intervertebral foramen (spinal canal stenosis)

Lumbar spondylosis with degeneration of the disc and facet joint, leading to narrowing of the spinal canal and intervertebral foramen (spinal canal stenosis)
International Psychopharmacology Algorithm Project (IPAP) generalized anxiety disorder (GAD) algorithm flowchart. Yellow, first-line treatment (nodes 3–6);

International Psychopharmacology Algorithm Project (IPAP) generalized anxiety disorder (GAD) algorithm flowchart. Yellow, first-line treatment (nodes 3–6);
Corneal filaments in a 56-year-old patient with dry eye syndrome.

Corneal filaments in a 56-year-old patient with dry eye syndrome.
Demonstration with fluorescein staining of punctuate epithelial erosions found in dry eye syndrome due to Sjogren's syndrome, with greater distribution.

Demonstration with fluorescein staining of punctuate epithelial erosions found in dry eye syndrome due to Sjogren's syndrome, with greater distribution.
The patient should look up to prevent the medication from first “hitting“ the cornea, which stimulates tearing and dilutes the medication. One drop of.

The patient should look up to prevent the medication from first “hitting“ the cornea, which stimulates tearing and dilutes the medication. One drop of.
Central retinal vein occlusion

Central retinal vein occlusion
Calibration of prisms. Glass prisms and spectacle prisms are calibrated according to the Prentice position, whereas plastic prisms are calibrated according.

Calibration of prisms. Glass prisms and spectacle prisms are calibrated according to the Prentice position, whereas plastic prisms are calibrated according.
Calibration of prisms. Glass prisms and spectacle prisms are calibrated according to the Prentice position, whereas plastic prisms are calibrated according.

Calibration of prisms. Glass prisms and spectacle prisms are calibrated according to the Prentice position, whereas plastic prisms are calibrated according.
Using the prosthesis as an assisting hand

Using the prosthesis as an assisting hand
Journal of Vision. 2004;4(9):3. doi: /4.9.3 Figure Legend:

Journal of Vision. 2004;4(9):3. doi: /4.9.3 Figure Legend:
From: Illumination discrimination in real and simulated scenes

From: Illumination discrimination in real and simulated scenes
(Data from Rosenfeld RL. N Engl J Med 2005; 353:2578–2588.)

(Data from Rosenfeld RL. N Engl J Med 2005; 353:2578–2588.)
Small bowel Crohn disease.

Small bowel Crohn disease.
“Mount Fuji Sign.” While not classic for the typical peaked pneumocephalus, note the compressive nature of the air collection at the surgical site. Source:

“Mount Fuji Sign.” While not classic for the typical peaked pneumocephalus, note the compressive nature of the air collection at the surgical site. Source:
LASIK. Diagrams of corneal flap (A) and multiple laser spots (B).

LASIK. Diagrams of corneal flap (A) and multiple laser spots (B).

Similar presentations

Ads by Google