Approaching her 91st birthday, Dame Judi Dench has offered a poignant insight into her worsening eyesight, describing the decline as "crushing".

The beloved actress, who was first diagnosed with age-related macular degeneration (AMD) in 2012, revealed in a candid interview with the Radio Times that her vision has deteriorated to the point where she can no longer see the television.

"Well, I miss seeing Clive Myrie doing Mastermind, but I can hear the questions," Dame Judi shared, underscoring the personal impact of her condition.

Her continued openness about AMD has consistently drawn vital public attention to the eye disease.

Following these latest remarks, Denise Voon, a clinical adviser at The College of Optometrists, provided further explanation on what age-related macular degeneration entails, outlining its different forms and the key symptoms individuals should be aware of.

Dame Judi Dench has opened up about her worsening eyesight after being diagnosed with AMD in 2012 (PA)

What is age-related macular degeneration?

There are two main types of AMD.

“There’s dry AMD and wet AMD, and although they fall under the same umbrella, they are quite distinctive,” explains Voon.

She highlights that dry AMD is the most common type.

“The cells at the back of the eye and the retina gradually degenerate with with age and can lead to deposits called drusen,” explains Voon.

While a few small drusen are a natural sign of ageing, numerous small drusen, or larger ones, can be a sign of progression towards AMD, according to the The College of Optometrists’ website.

“Dry AMD is usually very slow progressing and many people don’t notice any issues for years,” says Voon. “A lot of people have quite near normal vision, but if dry AMD gets a lot worse, it can lead to visual problems.”

However, wet AMD tends to develop and impact your vision more rapidly.

“Wet AMD is much less common, but it can impacts your vision quite a bit more,” notes Voon. “It occurs when abnormal blood vessels grow into the retina and then they leak, and they can cause a very sudden and rapid loss of vision.

“What a lot of people say is that they went to bed and seemed absolutely fine and then when they woke up, they couldn’t see.”

Who is more likely to be affected?

The older we are, the greater our risk of developing the condition. Around one in every 200 people has AMD at 60, according to Macular Society.

There is also several other risk factors.

“If you’ve got family history of it that can be a risk factor,” says Voon. “Obesity and having an unhealthy diet can also increase your risk, but the biggest risk factor for AMD is smoking.”

What are the main early signs to look out for?

“What people often first notice, and this is both the same with wet and dry AMD, is that the straight lines can appear distorted or bent,” says Voon. “They look at a window frame and say hang on, why does that look bent?”

Smudges and bright light sensitivity is another common sign.

“They might also notice spots or smudges in their central vision and bright lights may become much more uncomfortable,” says Voon. “When you have AMD it might take your eyes longer to adjust when moving from a dark room from a light room.

“In addition, colours can look faded but distortion and not being able to see in your central vision are usually the most common symptoms.”

How is AMD diagnosed?

Regular checks of the eyes, particularly in older age, is important to identify any issues early on (PA)

“We’d recommend going to see your optometrist at least every two years because often early stages of AMD are picked up during an eye test,” recommends Voon. “You might not notice any symptoms at all, but your optometrist might be able to see the drusen deposits that are present in dry AMD.

“Then if you have a very sudden, rapid loss of vision and it might be wet AMD, then the best thing is to contact your optometrist and get them to have a look, and they’ll be able to refer you for treatment.”

How can it affect someone’s everyday life?

“It usually affects your central vision, so reading can be more difficult and just getting around can be more difficult,” highlights Voon. “One of the really common things that people complain about is they just can’t recognise faces because it’s just that central part that’s been blurred out.”

If left untreated, it can lead to serious consequences.

“If wet AMD is left untreated, it can lead to scarring at the back of the eye, so then you would get sight loss,” says Voon. “Once it’s scarred, there’s nothing we can do treatment-wise, so one of the main consequences is that you could lose your central vision.”

Can it be treated?

Injections are the main form of treatment for wet AMD on the NHS.

“Anti VEGF (Vascular Endothelial Growth Factor) treatments help stops the abnormal growth of the abnormal blood vessels growing,” explains Voon. “It’s an injection into the eye and they are usually fairly regular.”

However, there is currently no formal treatment for dry AMD on the NHS.

“You can get some treatments for managing dry AMD privately, but they’re all quite new so we’re not quite sure how effective they are at this stage,” says Voon. “But there are some new, exciting things on the horizon that hopefully will will come in fruition, but they’re still currently in the approval stage.”

Optometrists can also provide advice on magnifiers or support with accessibility for phones, she adds.

“There are lots of support groups available as well, and The Macular Society are particularly active and really helpful,” says Voon.

Can it be prevented?

“Quitting smoking is the biggest and best thing you can do to help prevent AMD worsening,” says Voon.

It’s also important maintain a healthy weight and a normal blood pressure.

“Regular exercise and healthy diet including lots of green leafy vegetables are particularly good for macular health,” says Voon. “Furthermore, visiting your optometrist regularly is also crucial as if they see anything that needs treating, they can refer you for treatment and advise you on how best to keep your eyes healthy.”