Eye Floaters - Should I be Worried?

We are back with our second episode in association with the RCPE. 

Amie presents a case of eye floaters to Ben and he works through the case in real time. 

Test your own diagnostic skills and see if you can work out the diagnosis before Ben. 

Disclaimer: All patient stories discussed in Home of Medicine are informed by real patient interactions. However, all identifying details have been removed or appropriately modified to protect patient confidentiality. 

This podcast is intended for education and professional development and should not replace independent clinical judgement or specialist consultation.

Transcript

 [Dr. Ben Lovell]: Hello and welcome to a new episode of the Home of Medicine podcast, broadcasting from our new home at the Royal College of Physicians, Edinburgh. My name is Ben Lovell, and I am a consultant in acute and general medicine working in London. I am here with my co-.

 [Dr. Amie Burbridge]: Hi, I'm Amie Burbridge. I'm a consultant in acute and general medicine working in the Midlands, United Kingdom. Thank you, Ben.

 [Dr. Ben Lovell]: My records tell me that it is your turn to present a clinical case today for me to work through. Whenever you're ready, I am all ears.

 [Dr. Amie Burbridge]: Absolutely. This is a case I saw very recently in the Same Day Emergency Care (SDEC) unit. A 62-year-old female was referred by her General Practitioner (GP). The referral letter stated: "I'm very worried that this lady has had a migraine or a transient ischemic attack. Please assess."

 [Dr. Ben Lovell]: That is a kind referral setup.

 [Dr. Amie Burbridge]: On deeper history taking, the patient noted that while at work five days prior, she developed floaters in her left eye and noticed that the first three digits of a phone number were missing from her visual field. She felt a distinct pressure over the left eye.

It was uncomfortable rather than acutely painful, but she felt an urge to physically press on the globe. She also experienced photophobia. The initial episode lasted 20 to 30 minutes before the floaters dissipated. What are your initial thoughts, Ben?

## Deconstructing the Initial Differential Diagnosis

 [Dr. Ben Lovell]: I am writing this down. It is fair play to the GP; those symptoms could absolutely prompt concern. So, she is sitting at work, otherwise asymptomatic, until she experiences sudden visual obscurations blocking her vision, paired with localized discomfort over the eyeball that makes her want to rub it.

It lasts 30 minutes and resolves. To clarify, was this a generalized headache or localized eyeball pain?

 [Dr. Amie Burbridge]: I dug deeper into that exact point. There was absolutely no headache or cranial pain at the time; the discomfort was strictly localized over the single eye.

The following Thursday and Friday were completely uneventful. However, on Saturday, while watching television, she developed recurrent floaters and described a "ging" artifact in her left eye. She felt profoundly fatigued and went to bed early.

At 03:00, she woke up due to localized left eye pain, though she managed to return to sleep. By Sunday morning, her vision in that eye remained abnormal and persistently blurred.

Despite this, she went out for lunch with her family. She returned to work on Monday, still experiencing symptoms. She explicitly denies nausea, vomiting, focal limb weakness, speech changes, or auditory disturbances.

 [Dr. Ben Lovell]: How many episodes did she have in total? Two?

 [Dr. Amie Burbridge]: Exactly. She had one on the Wednesday, one on the Saturday, and woke up Sunday still feeling unwell. She describes a "g" in her left eye, like a traditional white sheet g. She saw her GP Monday morning, who considered an atypical migraine aura. She was given metoclopramide and sumatriptan, which provided no therapeutic benefit and instead induced mild nausea.

 [Dr. Ben Lovell]: I have noted five broad diagnostic categories:

• Transient Ischemic Attack (TIA): A classic TIA should not exceed 20 to 30 minutes. Because her symptoms recurred on Saturday and persist through Monday, this presentation violates the temporal definition of transience. It is not a TIA, nor does it fit a standard cerebrovascular stroke.
• Migraine with Aura: Migraine is a broad clinical umbrella. While acephalgic migraines can present with isolated visual auras lasting 20 minutes without hemicrania, a de novo presentation of a primary headache disorder is highly unusual in patients over 60. She also has no prior history of migraines, and the pain is strictly localized to the eye.
• Trigeminal Autonomic Cephalalgias (TACs): Conditions like cluster headaches focus intensively around the orbit and present with severe pain, conjunctival injection, lacrimation, and ipsilateral ptosis. However, the prolonged visual obscurations described here do not align with a TAC.
• Optic Neuritis: Demyelinating disease can present with retrobulbar eye pain, photophobia, and an acute central scotoma. This matches her inability to resolve the three phone digits, so I will keep this high on my differential list.
• Primary Ophthalmic Pathology: This includes structural and vascular issues such as vitreous hemorrhage, retinal artery or vein occlusion, acute glaucoma, or mechanical tearing. This is often terra incognita for general physicians, but we must investigate it.

 [Dr. Amie Burbridge]: That matches my initial reasoning. For context, her past medical history includes type 2 diabetes and hypothyroidism managed with low-dose thyroxine. She has gone through the menopause and takes hormone replacement therapy (HRT) via an estrogen spray and progesterone tablets.

Notably, she has been taking tirzepatide (Mounjaro) privately for three to four months, resulting in significant weight loss. She is otherwise highly active, a non-smoker, does not consume alcohol, and has no significant family history.

On clinical examination:

• Hemodynamics: Mildly hypertensive at 146/91 mmHg in the left arm and 142/87 mmHg in the right arm.
• Ocular Assessment: The left eye was visibly injected and red, while the right eye appeared normal.
• Cranial Nerves: Extraocular movements were fully intact, and cranial nerves VII, V, and XII were normal.
• Visual Acuity: Grossly reduced and severely blurred in the left eye, with the persistent "ging" artifact present.

I attempted fundoscopy, but like many acute physicians, I suffer from a degree of neuro-ophthalmophobia. I could confidently rule out gross papilledema, but I could not definitively assess the deeper structures of the posterior chamber.

 [Dr. Ben Lovell]: The presentation of an acutely injected, photophobic eye with a fixed visual deficit points strongly toward a localized ocular problem. While acute angle-closure glaucoma causes severe pain, injection, and visual obscurations, it typically triggers systemic symptoms like severe vomiting due to markedly elevated intraocular pressure, rather than intermittent, resolving episodes. Did you check any acute biomarkers?

 [Dr. Amie Burbridge]: I did not perform standard laboratory bloods beyond a point-of-care capillary blood glucose, which was stable at 6.7 mmol/L.

I found myself at a crossroads in clinic. The history did not truly align with a primary neurological or migrainous event. When managing clinical uncertainty, our primary responsibility is to consider and systematically exclude the most severe secondary etiologies.

Given her age, myopia requiring corrective lenses, and the specific combination of floaters and peripheral visual field loss, the possibility of a mechanical structural breakdown at the back of the eye became clear. I arranged an urgent review by the ophthalmology team the following morning.

 Cognitive Bias and the Strategy of Referrals

 [Dr. Ben Lovell]: That is an excellent clinical catch. It highlights why we must maintain a broad differential that extends beyond our immediate specialty boundaries. What did the specialists find?

 [Dr. Amie Burbridge]: They confirmed the diagnosis. Ophthalmic management relies heavily on slit-lamp biomicroscopy, dilated fundoscopy, and specialized ocular ultrasound to characterize the structural integrity of the retina.

Depending on whether a tear is rhegmatogenous, tractional, or exudative, interventions can range from clinical observation to targeted laser retinopexy to secure the tissue.

The critical lesson here is how easily we can be misled by framing bias. The initial referral letter explicitly framed the case around two specific diagnoses: migraine or TIA.

When a diagnosis is written down in black and white by a trusted colleague, it generates diagnostic momentum. As clinicians, we are conditioned to look for features that confirm that pre-existing frame rather than challenging it from a primary data level.

 [Dr. Ben Lovell]: It is an incredibly difficult cognitive trap to avoid. We naturally trust our colleagues and appreciate it when someone has narrowed down a complex presentation for us.

However, safe care requires us to find a balance: respecting the prior triage while maintaining a reflexive, open mind to look for features that do not fit the established narrative.

This also impacts how we structure our referral conversations. A high-quality specialty referral shouldn't simply ask a team to "take over" because a patient is too complex. Instead, it should pose an intelligent, specific question centered around targeted interventions or specialized diagnostic tools.

## Addressing Systemic Burnout in Medicine

 [Dr. Amie Burbridge]: Absolutely, Ben. This framing bias nearly caught me out because I initially spent time exploring a traditional migraine history before stepping back to look at the atypical nature of the "ging" artifact.

It is easy to succumb to "second reviewer syndrome," where clinicians down the line criticize the initial provider's reasoning. We must remember that everyone is working with limited resources under immense systemic pressure. When clinical environments become overwhelming, that cynicism can accelerate into profound burnout.

 [Dr. Ben Lovell]: Having experienced burnout myself, I completely agree. Practicing medicine requires us to offer each other grace, maintain kindness, and recognize our shared human vulnerabilities in high-stress environments.

 [Dr. Amie Burbridge]: It really does. A simple act of peer support, like a healthcare assistant offering a cup of tea during a chaotic shift, can completely reframe a clinician's capacity to cope with situational stress.

 [Dr. Ben Lovell]: That is a perfect note to conclude on. Navigating the cognitive boundaries between specialties and managing the framing of our diagnostic handovers is vital for both patient safety and clinician well-being. Thank you, Amie.

 [Dr. Amie Burbridge]: Thank you very much, Ben, and thank you to our listeners. Please rate, review, and subscribe wherever you access your podcasts, and a special thank you to the Royal College of Physicians, Edinburgh. Goodbye!

 [Dr. Ben Lovell]: See you later. Bye!

• Clinical Concepts & Pathologies: Transient Ischemic Attack (TIA), Migraine with Aura, Acephalgic Migraine, Trigeminal Autonomic Cephalalgias (TACs), Optic Neuritis, Acute Angle-Closure Glaucoma, Papilledema, Scotoma, Ocular Injection, Photophobia, Myopia, Framing Bias, Diagnostic Momentum.
• Diagnostic Tools & Interventions: Ophthalmoscopy, Fundoscopy, Slit-Lamp Biomicroscopy, Ocular Ultrasound, Laser Retinopexy, Capillary Blood Glucose.
• Pharmacology & Therapeutics: Tirzepatide (Mounjaro), Sumatriptan, Metoclopramide, Levothyroxine, Hormone Replacement Therapy (Estrogen/Progesterone).
• Organizations: Royal College of Physicians, Edinburgh; NHS; Same Day Emergency Care (SDEC).

• Q: How should an acute medicine physician differentiate a transient ischemic attack (TIA) from progressive structural ophthalmic pathology?
  • A: A TIA is defined by focal neurological or visual deficits that completely resolve within 24 hours, typically lasting less than 20 to 30 minutes. Persistent or progressive visual impairment spanning multiple days inherently violates the temporal definition of transience, indicating a fixed structural lesion, vascular occlusion, or mechanical detachment.

• Q: What clinical features differentiate atypical migraines from primary ocular diseases in patients over the age of 60?
• 
  
  • A: De novo presentations of primary headache disorders like migraines are highly unusual in patients over 60, necessitating a high index of suspicion for secondary causes. Furthermore, mechanical ocular pathologies often present with localized eyeball tenderness, injection, and unique scotomas described as floating shapes, whereas migraines classically manifest with unilateral hemicrania and geometric scintillating scotomas without ocular injection.
• Q: How do cognitive errors like framing bias and diagnostic momentum impact clinical safety during cross-specialty handovers?
  • A: Framing bias restricts a clinician's diagnostic lens by pre-conditioning them to accept the referring provider's working diagnosis as a baseline truth. This creates diagnostic momentum, where an incorrect label is continuously reinforced down the care pathway without independent verification, risking patient safety unless a reflexive, open-minded re-evaluation of the raw history is performed.