Ocular Examination Instruments / Devices Dr Mahmood Fauzi.
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Transcript of Ocular Examination Instruments / Devices Dr Mahmood Fauzi.
![Page 1: Ocular Examination Instruments / Devices Dr Mahmood Fauzi.](https://reader036.fdocuments.in/reader036/viewer/2022062421/56649d8d5503460f94a75d0c/html5/thumbnails/1.jpg)
Ocular Examination Instruments / Devices
Dr Mahmood Fauzi
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Eye examination unit
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A phoropter
contains different lenses used for refraction of the eye during sight testing, to measure an individual's refractive error and determine his or her
eyeglass prescription.
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Tonometer Determine Intraocular pressure (IOP), the fluid pressure inside the eye. calibrated
to measure pressure in millimeters of mercury (mmHg).
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Schiotz tonometer
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Applanation tonometer
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Non contact tonometer
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Slit lamp Instrument consisting of a high-intensity light source that can be focused to shine a thin sheet of light into the eye. It is used in conjunction with a biomicroscope. The lamp facilitates an examination of the anterior segment and posterior segment of the
human eye, which includes the eyelid, sclera, conjunctiva, iris, natural crystalline lens,
and cornea.
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Retinoscope Mirror and Streak
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A Retinoscope being used in conjunction with a trial frame and trial lenses in order to determine the patient's refractive error.
The working distance lens being one which has a focal length of the examiner's distance from the patient (e.g. +1.50 dioptre lens for a 67 cm working distance)
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Direct opthalmoscope
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Indirect opthalmoscope
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Snellen chart is an eye chart to measure visual acuity.
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E chartthis chart is useful for patients who are unable to read the Latin alphabet - for
example, very young children.
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The Landolt Chart-for those who can not read
-consists of a ring that has a gap, thus looking similar to the letter C. The gap can be at various positions (usually left, right, bottom, top and the 45° positions in between) and the task of
the tested person is to decide on which side the gap is.
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An Ishihara test image as seen by subjects with normal color vision and by those with a variety of color
deficiencies to test colour vision
Protanopia (red deficient: L cone absent)Deuteranopia (green deficient: M cone absent)Tritanopia (blue deficient: S cone absent)
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Trial box and frame
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A set of lenses used in refraction testing
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Autorefractor
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An intraocular lens (IOL) is a lens implanted in the eye used to treat cataracts or myopia.
Slit lamp photo of Pseudophakia: Posterior chamber Intraocular lens – note that Posterior capsular opacification is visible a few months after implantation of Intraocular lens in eye, as seen on retroillumination
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intraocular lens (IOL)
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Lacrimal canula
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Epiliation foreps
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Foreign body spud
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Chalazion clamp
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Chalazion scoop
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Flourescein strip stain a bright yellow-green when viewed with a Wood's lamp or cobalt blue filter.
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Electrocautery for electrosurgery to coagulate blood vessels and prevent haemorrhage
Thermocautery
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Phacoemulsification used for extraction of a cataract affected lens after emulsifying it using a high frequency (energy) ultrasound probe
Phacoemulsification and replacement with intraocular lens