What is a cataract?

Patients are always surprised when shown a photograph of their own cataract, but then understand why it is that they don't see well. The natural lens is like a large Smarty or M&M - essentially a lens made of protein. When young this is completely clear, but with age the protein becomes hazy, yellow or brown. This change is called a cataract. As the person with a cataract looks through this murky material their vision is also blurred as a result. 

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A yellow-brown cataract can be seen in the centre of the pupil in this recent patient

 

Cataract surgery removes the cloudy lens and replaces it with a crystal clear artificial lens implant. This lens can correct long-sight, short-sight and even astigmatism. Sophisticated lenses such as the trifocal lens implant can allow patients to read without glasses.

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The trifocal lens implant gives patients independence from glasses


Contact us if you'd like to find out more about achieving your best potential vision if you're having cataract surgery.

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Posted on October 2, 2017 .

Mr Angunawela is part of the team to win a National Patient Safety Award

Mr Angunawela is part of the winning team from Moorfields Eye Hospital that won a National Patient Safety Award on the 4th of July. The prestigious prize was awarded in the category for governance, risk management and patient safety and highlights the hospital's dedication to ensuring the best standards of care for its patients and its position as the leading eye hospital in the UK. The prize is competitively awarded nationally and across all medical specialities.

Patient safety awards

Mr Angunawela was the first to recognise a rare complication of drops prescribed after routine cataract surgery leading to loss of vision in some patients. This led to a focused team effort by doctors, pharmacists and risk management experts to address this issue resulting in a national alert trigger when the same combination of drops are prescribed anywhere in the country and no further complications reported over the last year since the problem was first recognised.

patient safety
patient safety award
Posted on July 5, 2017 .

Latest generation corneal collagen crosslinking for keratoconus

We're excited to be able to offer the latest Avedro Mosaic custom corneal collagen crosslinking using precise eye tracking to deliver treatment to the weakest part of the keratoconic cornea. This technology can significantly improve the overall shape of the cornea and improve vision. Moorfields Private is the first clinic in the UK to offer this state of the art technology to patients.

Posted on June 27, 2017 .

PTK laser improves vision in Reiss-Buckler corneal dystrophy

Reis-Buckler dystrophy

Reis-Buckler Corneal Dystrophy

This is a relative rare corneal dystrophy where a material is deposited under the surface of the cornea. As this material collects the persons cornea becomes frosty and hazy resulting in reduced vision.

This 21 year old patient had PTK excimer laser treatment to clear a central window in the corneal deposits to allow her to see. The results were almost instantaneous. 

Posted on June 26, 2017 .

Dont believe the hype - Symfony lens has the same rates of haloes and glare as other multifocal lenses

Medscape Coverage from the

 

Symfony Intraocular Lens Haloes Similar to Multifocals

Laird Harrison

May 09, 2017

LOS ANGELES — Patients implanted with the Tecnis Symfony extended depth of focus intraocular lens (IOL) (Abbott Medical Optics) may see haloes as troubling as those seen with multifocal IOLs, researchers say.

The new findings suggest the Symfony's advantages over older IOLs are less decisive than hoped.

Approved by the US Food and Drug Administration in July 2015, the Symfony had reached the market earlier in many other countries. Researchers from around the world presented their research on the lens here at the American Society of Cataract and Refractive Surgery (ASCRS) 2017 Annual Congress.

"One of the problems is that we've been anticipating the Symfony for so long in the [United States], that it's going to be a cure-all, and it's not," said Steve J. Dell, MD, medical director at Dell Laser Consultants in Austin, Texas.

However, experts agreed that the Symfony adds to the options for patients with presbyopia, particularly those for whom intermediate-range vision is paramount.

Standard monofocal IOLs provide clear vision only at one range. Multifocal IOLs are divided into sections that simultaneously focus light differently for different ranges. The sections that are out of focus sometimes cause haloes.

The Symfony instead uses echelettes, a type of diffraction grating, to extend the IOL's focus range. At the same time, it corrects chromatic aberration to enhance contrast. Previous studies had suggested that its halo and glare profile are comparable to those of a monofocal IOL.

That has raised the possibility that the Symfony could offer the best of both worlds: good vision at multiple ranges without haloes or glare.

 

But how does it compare to multifocal lenses in similar patients? Unable to find any head-to-head studies, Mary Attia, MD, from the Heidelberg University Hospital in Germany, and colleagues analyzed three groups of patients: two using multifocal lenses and one using the Symfony.

They implanted the bifocal AcrySof IQ ReStor SN6AD1 (Alcon) with a near addition of +3.0D in 40 eyes of 20 patients, the trifocal FineVision (PhysIOL) with an intermediate addition of +1.75D and a near addition of +3.5D in 21 eyes of 11 patients, and the Symfony ZXR00 and toric ZXT models in 31 eyes of 16 patients.

All three IOLs are available in Europe. The Symfony was approved for sale there in June 2014. The ReStor +2.5 is available in the United States, but the FineVision is not.

The patients receiving the FineVision had a median age of 66 years, those receiving the ReStor had a median age of 55.5 years, and those receiving the Symfony had a median age of 70 years.

All three performed well at long distances. The Symfony also excelled at a distance of 80 cm. But at 40 cm, the ReStor SN6AD1 was the winner, with the Symfony a distant third.

On average, the recipients of the three types of lens gave them similar ratings for haloes, about in the middle of a 0 to 10 scale, where 10 is so bad patients would not consider driving. The differences among the three lenses for this measure were not statistically significant (P > .05).

Table. Visual Acuity Compared

IOLMedian uncorrected distance visual acuity (logMAR)Median uncorrected intermediate visual acuity at 80 cm (logMAR)Median uncorrected near visual acuity at 40 cm (logMAR)Haloes (0 - 10 scale of increasing severity)

FineVision (Trifocal)−0.02−0.040.075.10

ReStor SN6AD1 (Bifocal)−0.060.01−0.035.00

Symfony (Extended Depth of Focus)−0.04−0.080.146.35

There was a trend toward better glare ratings for the Symfony, but Dr Attia did not present calculations on statistical significance for this measure.

Patients implanted with the Symfony were more likely to report needing glasses for seeing at far distance than patients implanted with either of the other types of lens, and more likely to report needing glasses for reading than the patients implanted with the ReStor SN6AD1. Dr Attia did not provide statistical significance for this comparison, either.

Clinicians should talk to their patients about the pros and cons of each lens before implanting them, Dr Attia said. "It's really according to the patients' lifestyle."

The Symfony might work best "for patients who care a lot about computer work, more than reading," she told Medscape Medical News. "Patients who read a lot would need reading glasses anyway."

 

For occasional, brief reading tasks, all the IOLs in the study might work without reading glasses, she said. In contrast, "a golf player would not be a good candidate for any of these lenses."

Patients may also benefit from combinations of multifocal IOLs, said Dr Dell, who reported favorable results in a study in which 100 patients received the +2.75 D (ZKB00Tecnis Multifocal 1-piece in their dominant eye and 75 patients received the +3.25 D (ZLB00) and 25 received the +4.00 D (ZMB00) in the nondominant eye.

More recently, he has successfully tried blending the Symfony with other IOLs as well. "The dysphotopsias are different and smaller, but they're not zero," he said.

In the discussion that followed these presentations, some experts said they preferred to aim for emmetropia with the Symfony, and others for a slight plus correction.

"The main news is that there are a lot of excellent options," session panelist Phillip C. Hoopes Jr, MD, from Intermountain Healthcare in Draper, Utah, told Medscape Medical News.

He agreed with Dr Attia that the Symfony adds to the options for patients who need good intermediate vision for computer work.

Dr Dell reported financial interests in Abbott, Advanced Tear Diagnostics, Allergan, Bausch + Lomb, Lumenis, Optical Express, Presbyopia Therapies, and Tracey Technologies. Dr Attia reported financial relationships through her institution with Alcon, Alimera, AMO, Carl Zeiss Meditec, CIMA, Contamac, Hoya, HumanOptics, Kowa, Mediphacos, Novartis, Oculentis, Ophtec, PowerVision, Rayner, and SIFI. Dr Hoopes reported relationships with AcuFocus, and SUN.

American Society of Cataract and Refractive Surgery (ASCRS) 2017 Annual Congress. Presented May 8, 2017.

Posted on June 15, 2017 .

Xtrafocus implant offers non-multifocal cataract surgery patients the option to improve reading vision after monnofocal lens implants

A new product from Morcher takes advantage of the pinhole effect to enhance depth of focus and will allow patients who have previously had cataract surgery with a monofocal lens a second chance to improve unaided reading vision if they missed out on the opportunity to have a multifocal lens at the time of their primary surgery.

Morcher Xtrafocus implant

The new implant has a 1.30mm central pinhole and is placed in front of the previously implanted monofocal lens. The pinhole aperture achieves 3D of near focus in the non-dominant eye and aids reading vision. The surgery is performed through a tiny 2.4 mm incision under local anaesthetic and would take less than 10 minutes to perform. It has the added benefit of being reversible with easy removal of the implant leaving behind the underlying intraocular lens in case of dissatisfaction.

Some patients may require additional YAG laser or laser eye surgery to achieve optimal vision. 

 
Posted on May 21, 2017 .