Ectopia lentis (lens dislocation): symptoms, causes, and treatment
Severe double vision, blurred vision, or flickering vision after a blow to the eye or head are reasons to suspect a lens dislocation. The sooner an ophthalmologist examines your eye, the better the chance of preserving your vision.
Below, we discuss how to recognize lens dislocation and what we offer to patients.
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What is lens dislocation?
The crystalline lens of the eye is a transparent lens. It focuses light onto the retina and is responsible for image clarity. It is held in place by thin filaments called the zonules of Zinn. When these filaments break or lose elasticity, the lens slips out of place.
Doctors call this condition ectopia lentis. Commonly referred to as dislocation, it causes light to refract abnormally, deteriorating vision. The extent of this deterioration depends on the degree of displacement.
What's the difference between a subluxation of the lens and a complete dislocation?
The deciding factor is how many ligaments remain intact. With a subluxation of the lens, some of the ligaments support the lens, and it only tilts or shifts slightly, remaining behind the pupil. With a complete dislocation, there is no support, and the lens falls into the vitreous or protrudes into the anterior chamber.
This determines both the patient's complaints and the time it takes to seek treatment. A partial dislocation remains unnoticed for a long time, while a complete dislocation usually causes a sharp decline in vision and requires a quick surgical decision. A table is helpful for comparing both options.
| Symptom | Subluxation | Complete Dislocation |
|---|---|---|
| Degree of Dislocation | Partial: Part of the ligaments holds the lens in place | Complete: The ligaments are torn, the lens has moved into the vitreous or anterior chamber |
| Vision | Moderately decreased, sometimes remains functional for a long time | Significantly decreased, up to a sharp loss of visual acuity |
| Complaints | Double vision, "fog," unstable image | Severe distortion and severe visual impairment |
| Risk of complications | High | Very high |
The table is only a guideline. The doctor will see the exact picture during an in-person examination. Based on this, they will choose their treatment plan.
What are the different types of lens displacement?
The direction of the displacement often suggests the cause. With congenital laxity of the ligaments, the lens moves upward and toward the temple. After an injury, it moves downward or backward, into the vitreous. If the lens has shifted forward, into the anterior chamber, this is the most dangerous option.
With anterior displacement, the lens blocks the outflow of intraocular fluid. Therefore, pressure spikes within hours. The further it has shifted and the more severely the ligaments are damaged, the greater the risk to vision.
Why does ectopia lentis occur?
There are several causes, but the mechanism is the same. The zonular ligaments that support the lens weaken. They are conventionally divided into:
- Trauma
- Hereditary diseases
- Associated eye changes
Let's look at each group in turn.
Eye trauma as a common cause
Eye trauma is the most common cause of acquired displacement. Blunt impact, contusion, or penetrating injury stretch and tear the zonular ligaments. The lens loses support. Vision deteriorates either immediately or weeks or months later. Therefore, after a blow to the eye or head, it is wise to see an ophthalmologist, even if you feel well.
Congenital weakness of the zonular ligaments
Some cases are associated with hereditary connective tissue diseases. Lens displacement is a typical symptom of Marfan syndrome. Less commonly, it accompanies Weil-Marchesani and Ehlers-Danlos syndromes, as well as homocystinuria. In this syndrome, the lens typically moves upward and toward the temple in both eyes.
In these patients, the ligaments are weak from birth. Therefore, the lens shifts gradually and without any trauma. The problem is often noticed in childhood, during a routine eye exam.
Concomitant conditions and postoperative changes
Ligaments also weaken in other conditions:
- Pseudoexfoliation syndrome
- High myopia
- Advanced cataracts
- Age-related fiber degeneration
Postoperative changes are a separate issue, when either the patient's own lens or a previously installed artificial lens loses support.
According to clinical observations, lens displacement in more than half of patients increases intraocular pressure and leads to secondary glaucoma. This is a compelling reason not to delay an examination.
General information
How We Diagnose at K+31
Diagnosis of lens dislocation begins with a conversation with the patient and an examination. The doctor asks:
- Have there been any eye injuries or surgeries?
- Are there any hereditary diseases?
- How quickly and to what extent has vision changed?
An ophthalmological examination is then performed using instruments. These help assess the position of the lens, the condition of the ligaments, and adjacent structures. Based on the examination results, the doctor determines monitoring strategies or discusses surgical treatment if the displacement affects vision and there are medical indications.
Slit Lamp Examination
The main instrument used during the examination is a slit lamp. Under high magnification, the doctor can see the position of the lens, its tilt, and vibration, and also evaluate the ligaments. This confirms the presence of lens displacement and determines its degree.
Visual acuity and intraocular pressure testing
We also test visual acuity with and without correction and measure intraocular pressure. Lens displacement often increases intraocular pressure, and early detection of this displacement helps protect the optic nerve from overload. Therefore, tonometry is performed even for moderate complaints.
Ultrasound and ultrasound biomicroscopy
When the lens is poorly visible or its position needs to be clarified, an ultrasound can be helpful. Ultrasound biomicroscopy is used for a detailed examination of the ligaments and the anterior segment – it shows where the filaments have broken and where the lens has shifted. The surgeon needs this data to plan the surgery in advance.
Additional assessment of the retina and optic nerve
Lens displacement is rarely the only problem. Therefore, we examine the fundus, evaluate the retina and optic nerve, perform optical coherence tomography if necessary, and check the anterior chamber angle. The retina is particularly vulnerable: it is important to detect its detachment or tears promptly.
When we notice lens displacement, we immediately check the intraocular pressure, the retina, and the condition of the ligaments. This helps us choose the appropriate treatment strategy more quickly and save the patient's time. – ophthalmologist at the K+31 Center
Frequently Asked Questions
Is it possible to treat a dislocated lens without surgery?
Is a dislocated lens dangerous to vision?
What should I do after an eye injury?
How quickly should I see a doctor?
References
- Clinical Guidelines of the Ministry of Health of the Russian Federation — https://cr.minzdrav.gov.ru/
- Russian Medical Journal — https://www.rmj.ru/
- Ophthalmology Journal (Mediasphera) — https://www.mediasphera.ru/journal/oftalmologiya
- EyePress - https://eyepress.ru/
- CyberLeninka - https://cyberleninka.ru/
- eLIBRARY - https://elibrary.ru/
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Symptoms of lens dislocation
Symptoms of lens dislocation depend on how far and where the lens has shifted. With a mild subluxation, a person may not notice anything at all. With a noticeable shift, vision is noticeably distorted, and it's difficult to ignore.
How does lens displacement manifest itself?
Most often, patients complain of double vision, a floating or flickering image, and decreased visual acuity. Sometimes, one eye sees two different outlines of an object. Glare, distortion of straight lines, fatigue, and headaches with visual strain are also observed.
Pupil behavior also changes: its edge trembles with eye movement, as the lens shifts with it. Any of these signs is a reason to make an appointment without waiting for things to get worse.
When to see an ophthalmologist urgently
Some symptoms are urgent. You should see an ophthalmologist the same day if you experience:
Anterior lens shift is especially worrisome. This is because the fluid outflow is blocked, and the pressure builds up very quickly. In this case, help is needed within a few hours.