Transcript A phoropter contains different lenses used for refraction of the eye

Ocular Examination
Instruments / Devices
Dr Mahmood Fauzi
Eye examination unit
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
.
Tonometer
Determine Intraocular pressure (IOP), the fluid pressure inside
the eye. calibrated to measure pressure in millimeters of mercury (mmHg).
Schiotz tonometer
Applanation tonometer
Non contact tonometer
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
.
Retinoscope
Mirror and Streak
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)
Direct opthalmoscope
Indirect opthalmoscope
Snellen chart is an eye chart to measure visual acuity.
E chart
this chart is useful for patients who are unable to read the Latin
alphabet - for example, very young children.
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.
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)
Deuteranop
ia (green
deficient: M
cone
absent)
Tritanopia
(blue
deficient: S
cone
absent)
Trial box and frame
A set of lenses used in refraction
testing
Autorefractor
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
intraocular lens (IOL)
Lacrimal canula
Epiliation foreps
Foreign body spud
Chalazion clamp
Chalazion scoop
Flourescein strip
stain a bright yellow-green when viewed with a Wood's lamp or
cobalt blue filter.
Electrocautery for electrosurgery to coagulate blood
vessels and prevent haemorrhage
Thermocautery
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