REFRACTIVE ERRORS imperfections in the focusing power of the eye, for example, hyperopia, myopia, and astigmatism. Your cache administrator is webmaster. Foster – Fuchs's spots 43. require systemic analgesia for severe pain• BCTL removed once epithelial defect healed (avg 3- 4 days).• Abx continued several more days, and steroids for up to 3 months post-op.• Visual acuity http://supercgis.com/refractive-error/refractive-error-changes.html
We use our macula to read or to stare intently at an object. 6.
ACCOMODATION 26. NEAR VISION ERROR(READING ERRORS) 30. 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 Share Email Refractive errors byAhmed Almumtin 12180views Optics of human eye & refractive er...
SlideShare Explore Search You Upload Login Signup Home Technology Education More Topics For Uploaders Get Started Tips & Tricks Tools Optics of human eye & refractive errors Upcoming SlideShare Loading in Start clipping No thanks. Laser technology• In myopia, laser flattens central cornea to decrease its focusing power to bring secondary focal point back to retina.• In hyperopia, the laser removes peripheral corneal tissue thereby secondarily bySahithi Ganeshula 19871views Eyes - Refractive Errors.ppt byShama 16632views Refractive errors of eye ophthalmol...
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 HELP BRING THE LIGHT TO FOCUS WHAT TYPE OF LENS CANIn fact any refractiveTHE RETINA? byovernment medical... 4955views learn about Structure of human eye ... Create a clipboard You just clipped your first slide!
Generated Wed, 26 Oct 2016 18:22:15 GMT by s_nt6 (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 OPTICS 101: REFRACTION 5. Uncorrected, light focuses in front of foveaCorrected by divergent lens, light focuses on fovea 15. 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
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 contact form This will make eyes feel cool and fresh.
SIMPLE HYPERMETROPIA Commonest form Results from normal biological variations in the development of eyeball Include axial and curvatural HM May be hereditary 56. Congenital myopia Common in premature babies or with birth defects Stationary(8-10D) Associated with Increase in axial length Esotropia Other congenital anomalies of eye Early and 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 have a peek here PATHOLOGICAL CAUSES OFMYOPIA• KERATOCONUS 21.
Young children(<6 or 7yrs) Some degree of hypermetropia is physiological so no correction Treatment required if error is high or strabismus is present working in school small error may require Now customize the name of a clipboard to store your clips. LASIK enhancements are also easily performed. 62.
Select another clipboard × Looks like you’ve clipped this slide to already. Basic Optics• Optics is the properties of light as it is acted on by optical systems• Geometric optics: uses line diagrams to depict the behavior of light• Wavefront optics: uses principles The retina may be compared to the film of a camera.
Retinal - oblique placement of macula [rare] 88. • Symptoms : Blurring of vision Asthenopic symptoms Tilting of head Squinting [Half closure of eyelid] 89. DISTANT VISION ERROR II: MYOPIA 39. …accommodation MYOPIA *Inof any help? Now customize the name of a clipboard to store your clips. Check This Out Corneal - abnormalities of curvature [common] 2.
CORRECTION 80. OPTICS 101 “REFRACTION” Emergent ray Refracted rayIncident ray 4. Start clipping No thanks. 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 spread of light also increases. Lacquer Cracks Breaks in Bruch’s membrane 40. Generated Wed, 26 Oct 2016 18:22:15 GMT by s_nt6 (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 SPECTACLES Basic principle Prescribe convex lenses (Plus lenses) so that rays are brought to focus on the retina Advantages Comfortable Easier method Less expensive Safe idea 73.