Don't you have a lens inside your eye? Let's talk about Aphakia!

Have you ever had blurry vision, like a camera lens going haywire? Sometimes we can't see things clearly, whether they're close or far away. A more serious side of this problem is a condition called aphakia. Simply put, this is when the lens inside your eye is completely gone. So today, let's talk about this in a little more detail .

What exactly is Aphakia?

Okay, let's first look at what the word `Aphakia` means. The simplest meaning of this is the absence of the natural lens inside your eye. You know, inside our eye, there is that colored part, which is the `Iris`, and the black spot in the middle, which is the `Pupil`, and behind that is this lens. This lens works like the lens of a camera. The main function of this lens is to collect the light rays coming from outside, focus them, and send them as a clear image onto the `Retina` at the back of the eye. So imagine, what would happen if this lens were to be lost? That's when everything starts to look blurry and unclear.

If this condition of aphakia is present in only one eye, we call it unilateral aphakia or monocular aphakia. Otherwise, if both eyes are missing lenses, it is called bilateral aphakia.

What is the difference between Aphakia and Pseudophakia?

Now you may hear another word, which is pseudophakia. Don't confuse the two.

• Aphakia is the absence of the natural lens in the eye.
• Pseudophakia is the implantation of an artificial lens (Intraocular Lens - IOL) into the eye. Often, cataracts develop, and the cataractous lens is surgically removed and replaced with this artificial lens.

Simply put, aphakia means that there is no lens at all. Pseudophakia means that there is a duplicate, that is, an artificial one, in place of the original. Got it?

Who can develop aphakia?

This condition can actually happen to anyone. However, it is most commonly seen in people who have cataract surgery, as I mentioned earlier. This is because the natural lens is removed during the surgery. Usually, it is removed and an artificial lens (IOL) is inserted. However, in some cases, especially when performing surgery on infants or young children, doctors may decide not to insert an artificial lens right away.

What are the symptoms of aphakia?

Okay, now let's see what symptoms you or someone you know might experience if you have aphakia. You may have one or more of these:

• Blurred vision:This is the main feature. Everything is blurred, like a fog.
• Difficulty seeing near and far objects: Because the lens is missing, the light entering the eye cannot be properly focused. Therefore, both near and far vision becomes blurred.
• Color blindness: Colors appear dull and lack the brightness they once had. But don't confuse this with color blindness. That's a different condition.
• Iris fluttering: This is medically known as ``Iridodonesis.'' When you move your eye, the colored part inside, the iris, may appear to move or quiver. This is because the iris, which is normally supported by the lens, loses its ability to focus.
• Difficulty adjusting to distance: When you suddenly look up and then down, or look down and then up, the eyes have difficulty adjusting to those distances.

Why does this aphakia occur? What are the causes?

There are several main causes of aphakia. Let's look at them one by one.

1. Due to surgery

As I mentioned earlier, cataract surgery is the main cause of this. During the surgery, the cloudy natural lens is removed. In most cases, an artificial lens (Intraocular Lens - IOL) is inserted into the eye instead. However, in some special cases, for example, when performing surgery on very young babies, doctors may decide not to insert an artificial lens right away. In that case, the eye becomes aphakic.

2. Due to congenital medical conditions

This means that a baby is born without a lens. This is called `(Congenital aphakia)`. This is a rare condition. Sometimes it can be accompanied by other birth defects of the eye. If the mother gets an infection like rubella during pregnancy, the baby can develop these conditions.

There are two types of ``Congenital aphakia``:

• Primary type: In this case, the lens does not develop at all during the embryonic stage.
• Secondary type: In this case, the lens begins to develop, but does not fully develop. There may be fragments of the lens remaining, but a complete functional lens is lost.

3. Due to eye injuries

A severe accident to the eye ``(eye injury)`` or an injury can damage the lens inside the eye, causing it to become detached or need to be removed. The loss of the lens due to an accident like this is called ``Traumatic aphakia``. Imagine, if something sharp hits the eye, or if a ball hits the eye hard, such as during sports, things like this can happen.

How do you know if you have aphakia?

The only way to know for sure whether you have aphakia is to have a complete eye exam by an ophthalmologist. During this exam, the doctor uses a special instrument called a slit lamp. It's like a large lamp and a microscope combined. It can tell you exactly whether you have a lens in your eye or not.

Sometimes, prenatal ultrasounds can detect congenital aphakia in a baby.

What are the treatments for aphakia?

The good news is that aphakia is a treatable condition. There are three main treatment options:

1. Surgery:

This is the most commonly used treatment. Here, an artificial lens, called an Intraocular Lens (IOL), is surgically implanted into the eye to replace your lost natural lens. This is a successful treatment.

2. Contact lenses:

For some people, especially young children or those who cannot have surgery, your doctor may recommend a special type of contact lens called aphakic contact lenses. These are not like regular contact lenses, but are very powerful. Some types used for young children can be worn for several days at a time, but some need to be changed daily.

3. Glasses:

If you have bilateral aphakia, which means you don't have lenses in both eyes, your doctor may recommend glasses. However, there are a few potential problems with glasses for this condition:

• The glass in those mirrors is very thick, which can make them heavy.
• Due to the power of glass, objects like straight lines can appear to be bent inward. This is called the ``Pincushion effect''.
• Depth perception may be impaired. It may be difficult to judge distance, such as when going down a flight of stairs.
• Some may also have cosmetic problems.

For reasons like these, doctors are often more inclined to recommend contact lenses.

What are the possible complications and side effects of treatment?

Some complications may occur during or with the treatment of aphakia.

• After cataract surgery and in young children with aphakia, a special type of glaucoma, called aphakic glaucoma , can develop, which is caused by increased pressure inside the eye. This can occur as either open-angle glaucoma or angle-closure glaucoma.
• Young children who have undergone cataract surgery, whether they have an intraocular lens (IOL) or aphakic contact lenses, will need to wear bifocals to prevent a condition called amblyopia , or "lazy eye."
• As children grow, their eyes change size. Therefore, any type of corrective lens they use (glasses or contact lenses) needs to be adjusted regularly. This is also done to prevent the condition called ``Amblyopia.''
• With aphakia, there is a risk of developing serious conditions such as retinal tears and retinal detachment .

Important: If a young child has aphakia, it is very important to follow the doctor's instructions and have regular checkups to ensure their vision develops properly. Otherwise, permanent vision impairments such as ``Amblyopia'' may occur.

How to reduce the risk of aphakia?

To be honest, there is no specific way to prevent aphakia from occurring, as it can be the result of surgery, a birth defect, or an accident.

However, you can do the following to maintain your eyesight and eye health :

• Get eye exams at regular intervals . It's a good idea to see an eye doctor at least once a year to get your eyes checked.
• Wear protective glasses when working, running, jumping, or playing, or when doing activities that could pose a risk to your eyes.
• Wear good sunglasses when going out in the sun. This can reduce damage to your eyes.
• Eat a healthy diet that includes green vegetables and fruits.
• If you smoke, quit. Smoking is also very harmful to the eyes.
• Always stay active.

Although these things cannot prevent aphakia, they can help maintain the overall health of your eyes.

What can you expect if you have aphakia?

Aphakia is a treatable condition. After treatment, you may not have 100 percent clear vision like someone with normal vision. However, with the right lenses (glasses, contact lenses, or intraocular lenses (IOLs)), you can usually achieve good vision .

If your baby has aphakia, your doctor will talk to you about the best treatment for him or her. For example, it may be safer for very young babies to wear contact lenses than to have an intraocular lens (IOL) surgery all at once.

When should I see a doctor?

You can't tell for sure if you have aphakia, only a doctor can tell you for sure. However, you can feel the symptoms that are affecting your vision.

• If you can't see clearly,
• If you have any doubts about your child's vision,

Definitely see a doctor, especially an ophthalmologist.

Protecting your vision is important for you and your doctor. Whether you have aphakia due to an accident, surgery, or your child was born without a lens, work with your doctor to determine the best treatment. Never miss your regular eye exams.

The most important thing we want to take home from this story (Take-Home Message)

Okay, so I hope you have a good understanding of the aphakia we talked about today. Here are some of the most important things to remember:

• Aphakia is the absence of the natural lens inside the eye, causing blurred vision.
• The main causes of this are cataract surgery, congenital conditions, and eye injuries.
• Fortunately, there are treatments for this. The main treatments are implanting an intraocular lens (IOL), wearing special contact lenses (aphakic contact lenses), or wearing special glasses.
• Especially for young children with aphakia, it is very important to start treatment early and to be under regular medical supervision so that their vision can develop properly. Otherwise, conditions such as "lazy eye" (Amblyopia) can develop and vision can be permanently impaired.
• If you notice any changes or blurring in your vision, see an ophthalmologist without delay.

Our eyes are one of the most precious gifts we have. Therefore, it is our responsibility to take care of them.

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