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Comprehensive eye exams include complete examination of the retina. Traditionally, this is done using high power plus lenses (such as 78 or 90 diopter fundus lenses by Volk) as an accessory to the slit lamp. Anyone trying to learn the technique may find it tedious to hold the lens close to the patient's eye, maintain the distance between the lens and the eye and move the lens in such a manner as to view the entire retina proficiently and quickly. The image viewed through the fundus lens is upside-down and inverted, resulting in erratic hand movement for the novice examiner when attempting to navigate around the retina. With prolonged viewing of the retina, the patient may feel annoyed by the amount of light used in the process and may end up blinking and moving the eyes almost involuntarily. While practicing for optometry competency exams, I came up with the idea of crafting the simple device shown in this video. It takes only a few minutes to put a few lenses from a trial case together and the crafted reduced eye can be used for long periods of practicing to master slit lamp funduscopy as well as the binocular indirect ophthalmoscopy technique. Any questions or comments, please feel free to write to the following email address: Aidin Safvati BSc, PhD Optom amunoruz@gmail.com
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Aidin Safvati
How to make a reduced eye
for fundus lens pracsAidin Safvati, BSc (Hons), PhD (UNSW)
Optometrist
Aidin Safvati
Copyright: All rights reserved and exclusive to the author.
Aidin Safvati
Three high plus power lenses from the trial case
Aidin Safvati
+18.00 diopters
Aidin Safvati
+20.00 diopters
Aidin Safvati
Another +20.00D lens
Aidin Safvati
A business card cut to size for the lenses and a 4mm
hole crudely cut in the middle
Aidin Safvati
Conventional bandage sticky tape
Aidin Safvati
Three strips of sticky tape, each about 8cm long
Aidin Safvati
One piece of the
sticky tape used to
put the three lenses
together
Aidin Safvati
A second piece added for improved stability of lenses
Aidin Safvati
The lens handles secured together using a piece of sticky tape
Aidin Safvati
The business card to serve as the aperture (pupil)
Aidin Safvati
The pupil is being transferred to the
reduced eye
Aidin Safvati
Sticky tape used to secure the aperture on the front
surface
Aidin Safvati
The front side of the reduced
eye is ready
Aidin Safvati
The rear view of the unfinished job
Aidin Safvati
My artificial retina : )
Aidin Safvati
Cut to size and ready for implantation!
Aidin Safvati
Time to hide the retina
behind the reduced eye, colored side
inwards
Aidin Safvati
Blank side outwards, colored side inwards
Aidin Safvati
The completed
job! Just need to hang
it off a slit lamp.
Aidin Safvati
One more piece of sticky
tape, that's what you'll
need
Aidin Safvati
Bend the edges
onto the sides of the handle to
secure the tape
Aidin Safvati
Hang the reduced eye from the head bar on the slit lamp.
You may wish to use a second piece of tape to adhere the lens
to the front of the head bar.
Aidin Safvati
Et voila! You have a patient who will never say no!
Just bring in your fundus lens and practice long enough to master the technique.
Aidin Safvati
Comments? Questions?Write to Aidin Safvati
amunoruz@gmail.comAlso view the video clip on YouTube (type in ‘reduced eye fundus’ in Google or YouTube)
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