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Correction Of Refractive Errors Ppt


See our Privacy Policy and User Agreement for details. 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 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 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. Source

Corneal - abnormalities of curvature [common] 2. Visual angles  ANGLE ALFA:angle formed between visual axis and optical axis at the nodal point  ANGLE GAMMA:angle between optical axis and fixation axis at the centre of rotation  UCVA 20/60 ... Pinhole glasses Autorefractor Phoropter View through an autorefractor 47.

Correction Of Refractive Errors Ppt

Contact lenses  Toric contact lenses Soft lenses [SL] Rigid gas permeable lenses [RGP] RGP do not conform to the asymmetry of corneal surface but replaces it totally and also provides F. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising.

Laser Sub-Epithelial Keratomileusis• LASEK can treat mild to moderate myopia and hyperopia +/- astigmatism.• Can be performed as an outpt with topical anesthesia• The corneal epithelium is incompletely incised using a PowerPoint Presentation Wave Aberration: Astigmatism Wave Aberration: Coma Wave Aberration: ... | PowerPoint PPT presentation | free to view GPS Error - The accuracy of GPS signals was intentionally degraded by For a small fee you can get the industry's best online privacy or publicly promote your presentations and slide shows with top rankings. Refractive Error In Children Ppt 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

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 Types Of Refractive Error Ppt Treatment :  Optical treatment : - RGP contact lenses -Hybrid contact lenses -Scleral lenses - Piggyback lens  Surgical treatment: - penetrating keratoplasty 95.  Astigmatism correction requires prescription of Retinal - oblique placement of macula [rare] 88. • Symptoms : Blurring of vision Asthenopic symptoms Tilting of head Squinting [Half closure of eyelid] 89. look at this site PATHOLOGICAL HYPERMETROPIA  Anomalies lie outside the limits of biological variation  Acquired hypermetropia  Decrease curvature of outer lens fibers in old age  Cortical sclerosis  Positional hypermetropia 

Myopia• Parallel rays converge at a focal point anterior to the retina• Etiology : not clear , genetic factor• Causes • excessive long globe (axial myopia) : more common • excessive Human Eye Optics Physics Spectacles 2. You can keep your great finds in clipboards organized around topics. Lenticular is rare.

Types Of Refractive Error 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. D= -.33m .33m 1mImage formed Power of light rays atat .33m from lens:lens P = -1/ 1. Correction Of Refractive Errors Ppt But aside from that it's free. Refractive Errors Of The Eye Pdf Well, you’ve come to the right place!

Your cache administrator is webmaster. http://fiftysixtysoftware.com/refractive-error/refractive-error-367-9.html Assimilate; Enjoy Ask Questions 21. RECAP• Light rays coming from infinity (>6m) are focused by a resting (non- accommodating) eye on the retina• Light rays coming from a finite distance (<6m) produce a blur image on byovernment medical... 5199views Refractive error byoptometry student 1603views Refractive Errors byOphthalmicDocs Ch... 1970views Share SlideShare Facebook Twitter LinkedIn Google+ Email Email sent successfully! Optics Of Human Eye Ppt

Why not share! The power contained in the light beam decreases as it is* Power = n/d spread ‘too thin’* n=1* ‘-’ sign for diverging light P = -1/ 0.5. at shri ram murti smarak institute of Paramedical sciences hospital and medical college,bareilly(u.p.) at Shri Ram Murti Smarak Institute Of Medical Sciences Hospital And Medical Collage (SRMS-IMS) good 3 years ago have a peek here Emmetropia 24-25mm 43 diopters 18 diopters Accomodation at rest 29.

Chromatic aberrations Different color rays have different focal length, as refractive indices of media varies with wavelength of incident light. 23. Optics Of Eye Ppt Why less in human eyes???  Due to narrow spectral sensitivity bands of long and mid wavelength cones.  Foveal lack of blue cones. 24. Symptoms : Defective vision Distorsion of objects Polyopia Investigations: - Placido's disc test reveals distorted circles - Computerized corneal topography 94.

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Can include UV protection . Presbyopia • Physiologic loss of accommodation in advancing age • deposit of insoluble proteins in lens in advancing age-->elasticity of lens progressivel y decrease-->decrease accommodation • around 45 years of age LASIK Complications• Potential complications: • Intra-operative flap complications: microkeratome complication with a higher rate with surgeon inexperience • Post-operative flap complications • Flap-bed interface epithelialization: that epithelial growth at the interface Refractive Power Of Human Eye Principle..

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 Require Care . Assimilate; Enjoy Ask Questions 13. Check This Out PATHOLOGICAL CAUSES OF MYOPIA* Cataract * Diabetes 22.

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