Sunday, 30 September 2018
Seeing correctly while driving is crucial to road safety. It's true that most of us can see while we drive, but are we really seeing everything we need to?
Of course there are the legal requirements to meet, but having sharp vision gives us more time to react to hazards in the road. Police are stopping drivers and conducting road side eye examinations. If your unable to read a licence plate at 20 meters your licence could be immediately revoked.
Large objects such as cars and road signs may be visible, but this isn't always a true representation of your vision. Having an up to date prescription and protection from glare can improve your vision.
The current UK driving laws only require vision to be tested once. It is then up to the driver personally to notify the DVLA if their vision becomes too poor to keep driving. With this new testing taking place across Hampshire, Thames Valley and West Midlands police the data found will give huge insight into visual standards nationally.
We sometimes forgot that our insurance providers will not hold the agreement if your vision is not meeting the requirement.
It has been great to see so many proactive patients coming to check their vision, book in to see one of our optometrists today.
Friday, 28 September 2018
UCL, University College London alongside Moorfields Eye Hospital led a study of infection in contact lens wearers. Since 2011, the researchers found three times as many incidences of Acanthamoeba keratitis in South-East England. A rare but preventable cause of blindness.
When contact lens users are aware of the risks involved in poor lens hygiene, they often adopt the correct habits and infection is unlikely. The increased cases illustrates the need for awareness.
Findings published in the British Journal of Ophthalmology, saw reusable contact lens wearers were at the highest risk. This group are more likely to have used ineffective lens solution, have water contaminate their lenses and admitted to poor lens hygiene.
What is Acanthamoeba keratitis (AK)?
- An eye disease affecting the cornea, the front surface of the eye.
- It becomes inflamed and painful due to the infection.
- The Acanthamoeba bug forms cysts during infection.
- It is not only contact lens wearers that can be infected, but wearers pose a higher risk due to contamination of lens cases.
What are the statistics?
- It can affect 2.5 in every 100,000 contact lens wearers.
- 25% of people with AK need corneal transplants to treat the disease or restore vision.
- A quarter of affected patients become severe cases, loosing up to 75% of their vision or going blind all together.
- Since 2000 - 2003 where incidences were 8-10 in a year, it's now noted that we treat between 36-65 cases annually.
What increases the risk?
- Researchers found that people were three times more likely to contract AK, if they had poor contact lens hygiene.
- Those who did not consistently wash and dry their hands as part of their lens routine.
- Also, in people who wore their contact lenses swimming or in hot tubs, while showering or face washing.
Where is Acanthamoeba found?
- The Acanthamoeba bacteria is actually found in the UK more commonly than in other countries.
- Water contamination is the main concern for the UK, as Acanthamoeba is found in higher levels in domestic water supplies, as opposed to mains water.
- As well as hot and cold water, it can also be found in soil.
How can I prevent an AK infection?
- Always follow your Optometrists advice on good lens hygiene and best practice.
- Wash and completely dry your hands before handling your lenses.
- Avoid wearing your lenses swimming, when washing your face or showering/bathing.
- Consider switching to a daily disposable lens, you can ask your optometrist to check your suitability and which lens type would be best for you. As the lens is replaced each day, there is no feeding ground for bacteria to grow over time and each lens is clean and fresh.
Wednesday, 26 September 2018
At our Fourmarks practice, Mrs H had been walking past when she decided to test her eyes with the Amsler grid in the window. What she found both surprised and frightened her, but we were able to see her the same day and diagnose the cause.
This is Mrs H's account of the day.
"How fortunate it was that I walked past Matheson Optometrists' window in Four Marks!I looked at the Amsler grid displayed in the window and discovered that the central vision of my right eye appeared black and misty and the straight lines had become wavy. I closed my right eye and peered at the grid with my left eye. No mist, no black circle, and no wavy lines. That discovery, in my right eye, made me very nervous and worried. I made an appointment immediately to see one of the optometrist. I saw Mr Andrew Matheson, who gave my eyes a thorough examination and, with the up-to- the-minute technology available at the practice, he was able to diagnose wet-eye macular degeneration. On hearing this, I was rather frightened, but with Mr Matheson’s calm, kindly reassurance and his immediate proactive response, I was able to go to an eye consultant and receive the necessary injection of Avastin in my effected eye.The sooner this injection is given, the better the prognosis. Having this injection so quickly, has meant I have a much higher chance of arresting the macular degeneration and saving my eyesight. It is vital to get to see a ophthalmologist within a couple of weeks of the symptoms starting. Under the NHS the aim is to be seen, and if required, treated within two weeks of the symptoms starting .How lucky I am to have looked into the Matheson Optometrists' window!
A big THANK YOU to Matheson Optometrist's at Four Marks."
Since the diagnosis, Mrs H has had injections at the local Hospital Eye Service and is under good care. Following treatment, Mrs H has added:
"Good news! Having had my second injection at Southampton Hospital Eye Unit, there is an excellent chance of either stopping the vision loss or of improving it. Early diagnosis is vital."
An Amsler grid which can be used at home to check your vision, for signs of macular degeneration.
Instructions for using the Amsler grid
Test your vision with adequate lighting.
Wear your reading glasses or look through the reading portion of your bifocals (if you normally read with spectacles)
With Progressive or Varifocal lenses you may notice some form of distortion. Distortions may occur as a result of the lens design and not your eyes. If you have a cause for concern please consult an eye care professional.
1. Hold the Amsler grid at normal reading distance (about 35cm).
2. Cover one eye at a time with the palm of your hand.
3. Stare at the centre dot of the chart at all times.
4. Do not let your eye drift from the centre dot.
You can find more about Amsler grids on our website, by clicking HERE.
Saturday, 22 September 2018
Tuesday, 18 September 2018
|A retinal scan using OCT, with a fluid pocket (the black circles within the layers of coloured sensory retina).|
OCT, the newest technology to sweep the optical industry. Without any invasive techniques or instruments, a simple scan done alongside your routine eye exam could potentially save your sight.
What does it show?
When our optometrists examine your eyes, they look into them through the pupil. Sometimes, if a patient has small pupils they are dilated, to give a wider view inside. Looking directly onto the retina, your eye health is assessed to look for changes that are or could affect your vision.
With the OCT, we are able to see a cross section through your eye. As if coming through from the side, the scan shows any leakage from blood vessels, haemorrhages. Debris building up in the macular, your area for central vision, reading and recognising faces, also known as age-related macular degeneration. The scan gives an objective measurement of structures in the eye, giving us a 3D model.
|Normal Anterior Chamber angle. The top curve is the cornea, which is the front of the eye. The bottom bumpy curve, is the iris, the coloured part of your eye.|
|A narrow anterior chamber angle, which could be at risk of closing.|
Newer attachments have allowed imaging of the front of the eye too. Viewing the angle made between the iris and cornea, allows assessment for Glaucoma. The corner of this angle is likened to a drain plug, where fluid created in the eye is drained away. There are some natural iris variations, which look open when viewed from the front, but with scanning can show exactly how wide and open the drainage is.
How does it work?
It uses scanning lasers, with high depth resolution and high speed acquisition. In a similar way as ultrasound, lots of individual sections are combined to create a 3D image. The OCT sends a optical signal, similar to a light source, into the eye and measures the time taken for the reflection to return. Different structures in the eye, reflect the signal at different lengths.
A technician will position you onto the chin and forehead rest, with your eye comfortably aligned, different scans will be taken. The process takes around 10 minutes to complete. An optometrist will review your scans and relay the results to you.
|Both images were captured using an OCT, the left image is how the practitioner sees the eye, when looking through. The image on the right, shows this same area as a cross section.|
Why is it important?
Often changes can happen within the eye, that we are not aware of. The OCT can measure structures that are translucent or lying beneath the surface of the retina. Before we can see and you can feel the changes, the scan will be able to detect them. Using this information, our Optometrists can advice you on the best way to proceed. In the case of AMD, taking a specific formulation of supplements can help to slow down the degenerative process. Though this only has an affect in the early stages of the condition. So the earlier we are able to detect changes, the sooner we can manage them.
So, do I need one?
It is always a good idea to have at least baseline readings that can be compared to at subsequent visits. If there happen to be any changes or new occurrences that need referencing. OCT scans are recommended for all our patients over 60. The frequency of scanning year after year, is dependent on any monitoring that is required. For some patients, ever other year is sufficient, others will need more regular check ups.
You can find more information on OCTs on our website. We also have an informational leaflet with a home monitoring Amsler grid at our clinics. All of our practices have the Zeiss Cirrus HD-OCTs, call us to arrange an your OCT scan.
Friday, 14 September 2018
Many people wear contact lenses for sport, special occasions or simply prefer them to their glasses. Modern lenses have come a long way since the traditional lenses first designed.
A daily disposable lens is exactly as it sounds. A fresh and clear lens is worn each day. Which is clean and has no oil build up. A properly fitted daily lens feels very comfortable, as it's thin and durable. An optometrist will fit them to the curve of your eye and make sure they interact well with your eyes.
There are lenses that can be worn for longer periods of time. At the end of each day, the lens is removed, rubbed and rinsed with cleaning solution and stored for next use.
High prescriptions are also now catered for. With lenses being able to correct astigmatism and even 'reading' contact lenses. Which like varifocals, have a distance and near part. Meaning you could enjoy a conversation and check the menu without having switch glasses (depending on the suitability of your prescription).
When you think about how much you move around during sports, this is where contacts really shine. As they are fit onto your eye, you have a much bigger field of view. You don't need to look through any gaps, distortion or around a frame. There are no reflections from spectacle lenses and rain drops wont block your vision either, nor will they steam up!
A daily disposable is often preferred if they lenses are only for occasional use, or a for a few hours at sports practice. If your looking for wear your lenses more consistently, maybe on a day to day basis a monthly lens would be more suitable. A monthly lens is as it says on the tin. Wear them for a few hours a day, clean them off and store for the next use. Then at the end of a month cycle, bin them and start a fresh.
Many parents are surprised to know that we fit children with lenses too. Most children and capable of inserting and removing lenses, they are quick to catch on and given good instruction, handle them safely. Lenses can help with sports at school, for children who need their glasses full time. It can help with their reaction times, confidence and view while playing.
Have you tried the new soft contact lenses? A fan of the RGP hard lenses? We fit contact lenses at all of our practices.
We also now have recycling bins in our practices, read more about how tiny contact lens materials can break up in the sea.Click Here
Tuesday, 11 September 2018
Patients who dispose of their old contact lenses by throwing them down the drain or
flushing them down the toilet could be contributing to the problem of microplastic
pollution, scientists say. Given the estimated 5 million wearers of contact lenses in the UK
alone, how many millions of people are disposing of these plastics improperly?
The American Chemical Society carried out a research that showed that 20 percent of more than 400 contact lens wearers, who were randomly recruited in an online survey, preferred to
flush their used contact lenses down the toilet or sink. There is information to support the
fragmentation of contact lenses into microplastics within a wastewater treatment plant.
Due to their size and packaging materials, recycling facilities typically cannot handle contact
lens processing, so they are diverted to landfills. A team concluded that microbes in the
wastewater-treatment facility actually altered the surface of the contact lenses, weakening
the bonds in the plastic polymers and promoting their disintegration into microplastics. The
lenses can then make their way into rivers, lakes and the ocean through runoff. Even if the
whole lens does not escape through waste water filters, the fragments of them can be risky,
too, contaminating the environment.
The fastest-growing part of the contact lens market is daily disposable lenses, which create a lot more waste. Microplastics, may be ingested by fish and other animals thereby entering the food chain.
As unfortunately, contact lens waste is unsuitable to be placed in our recycling bins, if you
are unable to get to one of our specialist contact lens recycling banks at our practices, our
advice is to dispose of your contact lenses in your regular non-recycling bin.