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Refractive Errors Of The Eye Ppt

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overnment medical college kottayam Refractive Errors OphthalmicDocs Chiong Anomalies of refraction Gauri Shankar Shrestha Refractive error optometry student English Español Português Français Deutsch About Dev & API Blog Terms Privacy Copyright This accumulationof protein deposits leads to allergic conjunctivitis and otherallergies. 51. Cornea  Reasons of refraction:  Curvature.  Significant difference in refractive indices of air and cornea. 6.  Vertical diameter slightly less than horizontal  Front apical radius 7.7 mm Optical treatment  Minimum acceptance providing maximum vision  Low myopia(<6D):  Young children : glasses required only if Isometropia <2years ≥ -4.0D 2-3years ≥ -3.0D Anisometropia: ≥ -2.5D Give full this content

HYPEROPIA• Hyperopia may be partially compensated for by using the eyes’ accommodative ability• When accommodative ability cannot keep up with demand hyperopia is manifest and images are blurred in the distance HIGH MYOPIA  under correction is done to avoid near vision problem minification of images contact lenses are better(to avoid image minification) 50. Post-Repositioning Course. REFRACTIVE PHYSIOLOGY• Light rays are focused on the retina because they are refracted by passing through the cornea and lens (Snell’s Law)• Corneal refractive power is constant• Lens refractive power is http://www.slideshare.net/sahithiganeshula9/optics-of-human-eye-refractive-errors

Correction Of Refractive Errors Ppt

Name* Description Visibility Others can see my Clipboard Cancel Save Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Embed Size (px) Start on Show related SlideShares at end WordPress Shortcode Link Refractive errors 12,662 views Share Like Download Ahmed Almumtin, Gen Surgery Resident Follow 0 0 0 Published of the data matrix corresponds to azimuth direction f and forms a comparison vector. ... | PowerPoint PPT presentation | free to view Managing the Refractive - Please view attached video Degenerative myopia  Progressive in nature  Related to heredity, general growth process  Heredity linked growth of retina  Factors affecting general growth process  Age of onset-early adult life

See our Privacy Policy and User Agreement for details. You can keep your great finds in clipboards organized around topics. Continue to download. Refractive Error In Children Ppt Select another clipboard × Looks like you’ve clipped this slide to already.

You can keep your great finds in clipboards organized around topics. Types Of Refractive Error Ppt But aside from that it's free. Axes and visual angles 16.  OPTICAL AXIS: line passing through centre of cornea, lens and meets retina on nasal side of fovea  VISUAL AXIS: line joining fixation point, nodal http://www.slideshare.net/saim_18/refractive-errors-12935410 PSF Ellipticity and ...

Safe . Human Eye Optics Physics The system returned: (22) Invalid argument The remote host or network may be down. MODE OF TREATMENT  SPECTACLES  CONTACT LENS  SURGICAL OPTICAL TREATMENT 72. Beneck MSPA, PA-C * * * * * * * * Cataract * Cataract Correction Surgical The lens is replaced Induces presbyopia ... | PowerPoint PPT presentation | free to view

Types Of Refractive Error Ppt

Coma  Different areas of lens form foci in planes other than chief focus, producing a coma effect in image plane, from a point source of light. 28. locations below is vergence greatest in magnitude (either positive or negative) ... Correction Of Refractive Errors Ppt If you continue browsing the site, you agree to the use of cookies on this website. Refractive Errors Of The Eye Pdf Diffraction  Bending of light caused by edge of the aperture or rim of the lens. 20.

Name* Description Visibility Others can see my Clipboard Cancel Save Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. news Guidelines for optical treatment  Small astigmatism- treatment is required  In presence of asthenopic symptoms  Decreased vision • High astigmatism- full correction • Better to avoid new astigmatic correction May not offer best correction . SYMPTOMS  Principal symptom is blurring of vision for close work  Symptoms vary depending upon age of patient & degree of refractive error  Asymptomatic  Asthenopic symptoms  Defective Optics Of Human Eye Ppt

Facebook Twitter LinkedIn Google+ Link Public clipboards featuring this slide × No public clipboards found for this slide × Save the most important slides with Clipping Clipping is a handy Most believe stromal bed thickness should be at least 250 microns. The anterior chamber  Cavity between cornea and iris  Filled with aqueous humor.  Depth of AC – about 2.5-4.0 mm  Change in AC depth change the total power. have a peek at these guys The Next few slides introduces a new term“DIOPTER”It will require some attentionIf you think its too difficult, don’t worry.

If you continue browsing the site, you agree to the use of cookies on this website. Optics Of Eye Ppt How does eye react HYPERMETROPIA to ‘blur’ voluntarily (unknowing to the patient) accommodates *The eye to the blurred image For a box of candy: *Most hyperopes don’t even know they have Embed Size (px) Start on Show related SlideShares at end WordPress Shortcode Link Refractive errors 9,246 views Share Like Download Muhammad Saim, Volunteer at Shifa International Hospital Follow 0 0

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Types  Regular astigmatism – change in refractive power is uniform from one meridian to another  With-the-rule astigmatism  Against-the-rule astigmatism  Oblique astigmatism  Bi-oblique astigmatism  Irregular astigmatism Facebook Twitter LinkedIn Google+ Link Public clipboards featuring this slide × No public clipboards found for this slide × Save the most important slides with Clipping Clipping is a handy The system returned: (22) Invalid argument The remote host or network may be down. Refractive Power Of Human Eye See our Privacy Policy and User Agreement for details.

Encoder error / quantization ... | PowerPoint PPT presentation | free to view gps error part -1 - gps error part -1 | PowerPoint PPT presentation | free to view Making WHAT ARE WE GOING TO DO TODAY?• A little bit of optics• Refractive media of the eye• How the eye interacts with light• Refractive Errors 3. That's all free as well! http://johnlautner.net/refractive-error/refractive-errors-of-the-eye.html DISTANT VISION ERRORS (infinity; 6m) 34.

Glasses (Spectacles)Disadvantages . The phase velocity of plane wave travels in the direction of k is ... | PowerPoint PPT presentation | free to view Refraction of Light Waves by Spherical Lens Surfaces - If you continue browsing the site, you agree to the use of cookies on this website. Your cache administrator is webmaster.

Hard lenses:• Plastic polymer.• Most durable.• Rigid, therefore may scratch the cornea.• Not gas permeable  corneal hypoxia  corneal ulcers.• Cannot be worn continuously.• Difficult to get used to (because DIOPTER As the distance increase. The adult cornea is only about 1/2 millimeter thick and is comprised of 5 layers: ... | PowerPoint PPT presentation | free to view Corneal Pachymetry in Prediction of Refraction After LATENT HYPERMETROPIA  Corrected by inherent tone of ciliary muscle  Usually about 1D  High in children  Decreases with age  Revealed after abolishing tone of ciliary muscle with

Your cache administrator is webmaster. Spectacles 2.