Ocular Examination Instruments / Devices

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Presentation transcript:

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) Deuteranopia (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