Eye Trauma: Symptoms, Concerns, and CT Scan Effects - Ophthalmology

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Ocular trauma can lead to a persistent sensation of visual discomfort or misalignment in the affected eye?


Hello, Doctor.
About two months ago, I was hit in the eye by a nail clipper thrown by a friend.
It was so sudden that I didn't have time to close my eyes.
I suffered a corneal abrasion and used medication for two days, after which it healed.
However, my eye has been very uncomfortable, feeling sore and swollen, and I have difficulty focusing with both eyes.
I went to the hospital for an examination, and there were no issues; my condition gradually improved.

A month later, I went to Thailand for a three-hour spa treatment.
During the session, I was lying down for a long time, which put pressure on my eyeball.
That evening, when I returned to the hotel, I felt a twitching sensation behind my eyeball, and my eye was particularly sore and seemed a bit swollen.
After a couple of days, I returned to Taiwan and had another examination.
The doctor ordered a CT scan, and again, there were no problems.

However, I seem to have developed new symptoms.
I noticed that at night, in dim indoor lighting, the pupil of my injured eye appears larger than that of my uninjured eye.
This does not happen in bright light or during the day.
Is it normal for the pupil to be larger in the injured eye regardless of whether it's indoors or outdoors?
Since the CT scan, I have become more anxious.
I worry that the originally injured eye may have sustained further damage due to the CT scan.
Could you please inform me how much harm CT radiation can cause to the eye? Prior to this injury, my eyes had no issues, and there is no history of eye disease in my family.

Can blunt trauma or a CT scan cause the injured eyeball to become more prominent? Over the past two months since the injury, I have undergone many examinations, and every time my eye feels uncomfortable, I go to the hospital.
After each check-up, I become anxious about the potential harm from frequent examinations.
I am really distressed.
Thank you.

Cherry, 30~39 year old female. Ask Date: 2018/02/24

Dr. Gao Pilin reply Ophthalmology


Hello Cherry: After a pupil injury, it is possible for the pupils to become unequal in size.
If the light is strong, the pupils may constrict, resulting in minimal difference.
However, in low indoor lighting, the difference can be quite noticeable.
Generally, this should not significantly affect vision.
A CT scan of the eyes utilizes light to create images of the tissues, and it involves no radiation, posing no harm to the body.
The Ophthalmology Department at Puzi Hospital in Taiwan is open Monday to Friday from 8:00 AM to 12:00 PM and Wednesday afternoons from 1:00 PM to 4:30 PM.
Online responses should only be used as a reference; if necessary, it is important to seek medical attention at a healthcare facility.
I hope to have the opportunity to serve you.
Gao Pilin

Reply Date: 2018/02/24

More Info


Understanding eye trauma can be quite complex, especially when it involves symptoms, concerns about diagnostic procedures like CT scans, and the psychological impact of ongoing anxiety about one’s health. Based on your description, it seems you have experienced a significant eye injury that has led to various symptoms and concerns.

Firstly, regarding the changes in your pupil size, it is not uncommon for pupils to react differently after an eye injury. The fact that you notice your injured eye's pupil appearing larger in dim light could be due to several factors. After trauma, the autonomic nervous system may respond differently to light stimuli, leading to unequal pupil sizes, a condition known as anisocoria. In bright light, pupils typically constrict, and in low light, they dilate. If your injured eye is not responding as well as your healthy eye, it may appear larger in dim conditions. However, this does not necessarily indicate a serious problem, especially if your vision remains stable and there are no other alarming symptoms.

As for your concerns about the CT scan, it’s important to clarify that while CT scans do involve exposure to radiation, the levels used in diagnostic imaging are generally considered safe and are unlikely to cause immediate harm to the eyes or exacerbate existing injuries. The radiation dose from a CT scan is relatively low compared to other medical procedures, and the benefits of obtaining a clear diagnosis often outweigh the risks. However, if you have ongoing concerns about radiation exposure, it is always a good idea to discuss these with your healthcare provider, who can provide reassurance and context based on your specific situation.

Regarding your anxiety about the potential for your eye to become more prominent or "bulging" due to blunt trauma or CT scans, it is essential to understand that while blunt trauma can lead to conditions such as orbital fractures or swelling, these typically manifest with other symptoms, such as pain, bruising, or changes in vision. If your CT scan showed no abnormalities, it is unlikely that your eye would become more prominent as a result of the scan itself.

Your ongoing discomfort and the feeling of not being able to focus properly could be related to several factors, including residual effects from the initial injury, muscle strain from compensating for the injured eye, or even psychological factors such as anxiety. It is not uncommon for individuals who have experienced eye trauma to develop heightened sensitivity or anxiety about their vision, which can lead to a cycle of discomfort and worry.

To address your concerns about frequent check-ups and the potential for harm, it is crucial to find a balance. While regular monitoring is essential after an eye injury, excessive worry can lead to increased stress, which may exacerbate your symptoms. Consider discussing your anxiety with your healthcare provider, who may recommend strategies for managing stress and anxiety related to your eye condition.

In summary, while your symptoms and concerns are valid, it is essential to maintain open communication with your healthcare provider. They can help you navigate your recovery, address your fears about diagnostic procedures, and provide reassurance about the healing process. Remember that healing takes time, and it is okay to seek support for both your physical and emotional well-being during this period.

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