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Technology

We have invested a lot in technology so we can provide a hospital level of eyecare to our patients. However, more important than any instrument are our skills as clinicians that allow us to choose what tests are necessary and how to interpret the results. This cannot be bought, and is something that we continue to develop with specialist training and work in hospital medical clinics.

tech 1

Biomicroscope & Digital camera

We use a biomicroscope to provide a magnified view of the structures of the eye. Its optical quality maintains high-resolution and contrast at even 40x magnification. The instrument incorporates a digital camera that can record images and videos for monitoring and patient education.

tech 2

Direct & Indirect lenses

To dynamically view the back of the eye we use a range of lenses in combination with our biomicroscope. Some lenses give direct views and others incorporate mirrors to see anatomy that would otherwise remain hidden. Many of these are specialist lenses that are only rarely found outside of hospitals. Our Principal Optometrists regularly hold workshops on university post-graduate courses and at conferences on the use of these less common lenses.

tech 3

SPECTRALIS

Early diagnosis and treatment decisions of retinal disease and glaucoma are based on small changes. Detecting change is limited by resolution and accurate alignment of follow-up scans. SPECTRALIS solves these problems by using cSLO technology to track the eye and guide OCT to the selected location. Not only are the scans guided on first examination to eliminate motion artifasts, but automatic retinal recognition based on the patterns of the retinal blood vessels enables follow-up examinations to be scanned in precisely the same exact location without relying on operator judgment.

tech 4

Humphrey VFA

A screening test is normally used to assess visual fields. This uses bright lights to quickly detect advanced disease, but will miss subtle problems. It is also not suitable for monitoring because it's a simple pass/fail test. A better way is to use a full-threshold strategy that shows lights of varying brightness to determine the dimmest light that can be seen in many locations. The gold-standard visual field test is the Humphrey Field Analyzer, which is used in almost all hospital clinics. It builds up a detailed map of light sensitivity and so detects problems earlier and can monitor for change over time.

tech 5

Eye Pressure

There are many ways of measuring the eye pressure. Most high-street opticians use an air-puff method because it can be delegated to unqualified staff, but it is not considered reliable and is unpleasant. As standard we use an iCare tonometer based on a rebound measuring principle, in which a very light-weight probe is used to make momentary contact with the cornea. The touch of the probe is so gentle that it is barely noticeable. When more accuracy is required we instil anaesthetic drops and use a Goldmann tonometer, which is the gold standard test used in hospital clinics.

tech 6

i.Terminal

Lens dispensing measurements play a key role in maximising visual comfort, as fitting errors can cause up to 40% loss in lens performance. We use the i.Terminal centration device to supplement traditional methods of dispensing. The technology digitally captures fitting parameters for optimal lens performance and to allow for advanced lens customisation. We can also use the camera feature to help spectacle wearers choose frames to resolve the problems caused by blurred vision.

Get in Touch

Telephone: (01454) 411760
Website: johnsonandfurze.co.uk

7 Chapel Street, Thornbury, BS35 2BJ

Opening hours

Monday - Wednesday 8:45 - 5:30
Thursday 8:45 - 7.00
Friday 8:45 - 5:30
Saturday 9.00 - 4.00