abc 123 OCT

For almost a year now we have had an OCT Scanner within the practice at eyelines.

OCT or Optical Coherence Tomography is basically an ultrasound for the eye. Instead of using sound waves to image structures within the body the OCT uses light waves to enable high quality imaging of sub surface structures of the eye –  generally the Retina.

 

This is a non invasive technique that enables viewing and measurement of the layers of the retina  that will help in the diagnosis and monitoring of Glaucoma and conditions affecting the retina such as: Macular Degeneration; Vascular Disease; Diabetic Retinopathy; Retinal Detachments.

 

It has proven to be a very useful addition to our testing routine and we have spotted a number of conditions much earlier than we would have been able to in the past, and been able to refer for treatment or been able to monitor for change ourselves.

Here are some of the scan images

 

 

 

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Scan of a healthy eye from a 15 year old.

 

 

 

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Scan showing sub retinal fluid around the Macular area that did not have much effect on the visual acuity. The patient was able to draw a vague area of distortion that he was aware of that matched the size and shape of the sub retinal fluid exactly.

 

 

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Scan showing a Macular hole and associated retinalschisis and epiretinal membrane.

 

Of course we never like discovering anything wrong with a patients eyes, it is much better to be able to do the scans and tell the patient that everything is perfectly healthy, but if we do pick up an abnormality we can get the patient referred to an eye hospital and treated.

 

The technology that is available to an optical practice now has changed by a huge amount even in the 20 or so years that I have been practicing. It will be interesting to see what the next developments are in the next few years.

 

 

 

camera-eye : eye-camera

I had a young patient (8 yrs old)  in for an eye examination  this week who was explaining to me how his teacher told the class that the human eye was based on a camera.

I did try and explain that really it was the other way round but he was having none of it because “his teacher told him that the eye was based on the camera and She is always correct”

The lens of the camera focuses light onto the film (or digital plate)

The lens inside your eye focus light onto the retina.

The aperture can be adjusted on a camera to let differing amouts of light in – in the eye it is the iris that does this job.

A camera lens can be moved backwards and forwards to change the focus – in the eye it is the Ciliary muscles that change the shape of the lens to alter the focus.

 

The young lad is quite keen on photography as am I and we got into a discussion about taking photos- it led to me looking through some of my old photo files – which is an excuse for me to post some images here.

 

(All of these images were taken by and are owned by me so please do not use them without permission.)

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Local children on the slopes of Mount Pinatubo – Philippines

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Manila Fish Market

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Alaskan Costal Brown Bear – near Anchorage

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American Bald Eagle

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Green Turtle

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Red Panda

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Zantedeschia aethiopaca

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The improvement in camera technology over the years means that all of us can become budding photographers with nothing more than our phones – although these were all taken with an Olympus E510 DSLR – except for the underwater shot of the turtle taken with a Fuji Fine Pix XP90