Refractive Errors Eye Ppt
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. 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 area is then washed with water and allowed to dry. OPTICS 101: LENSES CONCAVE LENS Virtual Image 3M (not really important for us) Parallel light rays (incident) Divergent light rays (incident) Divergent light rays (emergent) 3M Virtual Image MORE DIVERGING POWERAMOUNT check over here
Point on centre of cornea is considered as centre of pupil. 18. Al Fayez, MD, FRCS 2EmmetropiaDistance Vision Parallel (distant images) light is refracted by the Cornea the LensLight is focused on the Fovea images are clear Near VisionDivergent (near images) light rays They are all artistically enhanced with visually stunning color, shadow and lighting effects. Hyperopia• Symptoms • visual acuity at near tends to blur relatively early • nature of blur is vary from inability to read fine print to near vision is clear but suddenly useful reference
Correction Of Refractive Errors Ppt
Clipping is a handy way to collect important slides you want to go back to later. Refractive Components of the Eye • Cornea: responsible for the majority of the refractive power of the eye (40 D) • Lens: 20 D of refractive power, changes with accommodation • Generated Tue, 06 Dec 2016 07:13:26 GMT by s_hp94 (squid/3.5.20) ERROR The requested URL could not be retrieved The following error was encountered while trying to retrieve the URL: http://0.0.0.9/ Connection Refractive Error In Children Ppt SlideShare Explore Search You Upload Login Signup Home Technology Education More Topics For Uploaders Get Started Tips & Tricks Tools Refractive errors Upcoming SlideShare Loading in …5 × 1 1 of
Now customize the name of a clipboard to store your clips. Types Of Refractive Error Ppt Embed Size (px) Start on Show related SlideShares at end WordPress Shortcode Link Optics of human eye & refractive errors 20,992 views Share Like Download Sahithi Ganeshula, Resident Doctor at Anisometropia• Difference in refractive power between 2 eyes• refractive correction often leads to different image sizes on the 2 retinas( aniseikonia)• aniseikonia depend on degree of refractive anomaly and type of Our new CrystalGraphics Chart and Diagram Slides for PowerPoint is a collection of over 1000 impressively designed data-driven chart and editable diagram s guaranteed to impress any audience.
HIGH MYOPIA under correction is done to avoid near vision problem minification of images contact lenses are better(to avoid image minification) 50. Human Eye Optics Physics Please try the request again. Contact Lenses 3. Clipping is a handy way to collect important slides you want to go back to later.
Types Of Refractive Error Ppt
F. http://pubtz.com/refractive-error/refractive-errors-of-the-eye.php Uncorrected, light focuses behind foveaCorrected by convergent lens, light focuses on fovea 27. Surgery Monovision LASIK Monovision & CK IntraCor Refractive lens exchange Corneal Inlays & Onlays 82. Spherical aberrations A convex spherical lens refracts peripheral rays more strongly than paraxial rays, so peripheral rays are focused closer. 21. Optics Of Human Eye Ppt
Generated Tue, 06 Dec 2016 07:13:26 GMT by s_hp94 (squid/3.5.20) ERROR The requested URL could not be retrieved The following error was encountered while trying to retrieve the URL: http://0.0.0.7/ Connection COMPLICATIONS Recurrent styes,blepharitis or chalazion Accomidative convergent squint Amblyopia Anisometropic Strabismic Uncorrected bilateral high hypermetropia Predisposition to develop primary narrow angle glaucoma Care should DISTANT VISION ERROR I: HYPEROPIA (also known as hypermetropia) 36. this content Most of the presentations and slideshows on PowerShow.com are free to view, many are even free to download. (You can choose whether to allow people to download your original PowerPoint presentations
Recommended Improving Your Memory Time Management Fundamentals Project Management Fundamentals Optics of human eye & refractive errors Sahithi Ganeshula Refractive errors Muhammad Saim Eyes - Refractive Errors.ppt Shama Refractive errors of Optics Of Eye Ppt That's all free as well! Astigmatism• Symptoms • asthenopic symptoms ( headache , eyepain) • blurred vision • distortion of vision • head tilting and turning • Amblyopia – uncorrected astigmatism > 1.5 D• Treatment •
Glasses (Spectacles)Disadvantages . May not offer best correction . NEAR VISION ERROR(READING ERRORS) 30. Refractive Power Of Human Eye EffectiveDisadvantages .
Generated Tue, 06 Dec 2016 07:13:26 GMT by s_hp94 (squid/3.5.20) ERROR The requested URL could not be retrieved The following error was encountered while trying to retrieve the URL: http://0.0.0.6/ Connection Al Fayez, MD, FRCS Emmetropia Presbyopia Myopia Myopia Hyperopia Astigmatism Refractive Errors & methods of correction ... – PowerPoint PPT presentation Number of Views:2000 Avg rating:3.0/5.0 Slides: 13 Provided by: NEW164 Schematic eye and reduced eyes • Two principal foci • Two principal points • Two nodal points Gullstrand’s schematic eye: • Two principal foci • Single principal • Single nodal point P =-.5D d .5m 1m 2m 16.
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 DIOPTER As the distance increase. SPECTACLES Plus lens (or) Convex lens 81. DIOPTER• The Diopter also signifies the power of lens• The more the power the more the converging or diverging ability of the lens• Minus for Diverging lens (just like light rays)•
Principle.. CONTACT LENS ADVANTAGES Cosmetically good Increased field of view Less magnification Elimination of aberrations & prismatic effect 74. LASIK• LASIK can treat mild, moderate, and high myopia and hyperopia +/- astigmatism.• Can also be performed as an outpt with topical anesthesia• LASIK is now the most commonly performed refractive Corneal Refractive surgery.
Assimilate; Enjoy Ask Questions 13. sun, stars, galaxies) are parallel• All other light rays that originate from an object (TV, bulb, book) are divergent• Us ophthalmologists consider a distance of 6 meters or more as infinity PRESBYOPIA What do old people do to read without glassesAs the object is moved furtherThe light rays spread more decreasingnullify power The eye will try to accommodate to their the blur(Diopter; Fovea Light rays 10.
Laser Photorefrative Keratectomy (PRK) Laser Assisted In-situ Keratomileusis (LASIK) Laser Sub-Epithelial Keratomileusis (LASEK) About PowerShow.com PowerShow.com is a leading presentation/slideshow sharing website. Consistence of RE measurement - Keratometry, Retinoscopy & subjective ... | PowerPoint PPT presentation | free to view Optics ,Refraction , Errors of refraction and Contact lenses - Title: Clinical optics Generated Tue, 06 Dec 2016 07:13:26 GMT by s_hp94 (squid/3.5.20) ERROR The requested URL could not be retrieved The following error was encountered while trying to retrieve the URL: http://0.0.0.8/ Connection That’s why our impressive Templates for PowerPoint product line won the Standing Ovation Award for “Best PowerPoint Templates” from Presentations Magazine.