Can Wide-Angle Imaging Check Retina Without Dilation for High Myopia?

Can a retinal examination be performed without dilation using the fundus camera?

Due to light sensitivity, I find car headlights very bright at night, and I have a history of high intraocular pressure, which makes me unsuitable for dilated fundus examinations.
1.
I would like to know if there is an ultra-widefield camera available in Taoyuan for retinal examination? This way, I can avoid dilation.
Additionally, last week during a thunderstorm, I saw flashes in the sky, which I confirmed were from the lightning.
However, I became anxious about the possibility of retinal detachment, especially considering that individuals with high myopia have a 3% risk of developing it.
I researched and found that there are about 2 million people with high myopia in Taiwan, which means potentially 60,000 could be affected, and this thought makes me quite anxious.
2.
Is this high risk truly accurate? I have 600 degrees of myopia in both eyes and also experience floaters, seemingly around ten, although it's difficult to count them.
3.
How many floaters need to be present to be considered a significant number? Thank you.

Xiao Lin, 30~39 year old female. Ask Date: 2023/04/25

Dr. Cai Wenyuan reply Ophthalmology

Non-mydriatic fundus photography is generally used for screening diabetic retinopathy.
However, to examine the retina thoroughly, dilation is still necessary.

Reply Date: 2023/04/25

More Info

When it comes to high myopia, or severe nearsightedness, the risk of retinal complications, including retinal detachment, is indeed a significant concern. Patients with high myopia, especially those with an axial length greater than 30 mm, are at a higher risk for various retinal issues due to the elongation of the eyeball and associated structural changes.
1. Wide-Angle Imaging and Dilation: Wide-angle imaging, also known as ultra-widefield imaging, is a technique that allows for a more comprehensive view of the retina without the need for dilation. This method can capture up to 200 degrees of the retina in a single image, which is beneficial for detecting peripheral retinal issues. However, while this technology can provide valuable information about the retina, it may not replace the need for dilation in all cases. Dilation allows for a more thorough examination of the retina, especially in cases where there are concerns about retinal tears or detachments. If you have a history of high intraocular pressure and are sensitive to bright lights, discussing the possibility of wide-angle imaging with your ophthalmologist is a good idea. They can assess whether this method is suitable for your specific situation.

2. Risk of Retinal Detachment: The statistic you mentioned regarding the 3% risk of retinal detachment in individuals with high myopia is a general estimate. While it is true that the prevalence of retinal detachment is higher in myopic patients, the actual risk can vary based on individual factors such as the degree of myopia, family history, and the presence of other ocular conditions. For instance, patients with very high myopia (greater than -6.00 diopters) may have a risk that is significantly higher than 3%. It's essential to maintain regular eye examinations to monitor for any changes in your retinal health, especially if you experience symptoms such as flashes of light or an increase in floaters.

3. Understanding Floaters: Floaters, or vitreous opacities, are common in individuals with high myopia. The number of floaters can vary widely among individuals, and there is no specific threshold that defines "many" floaters. Some people may have just a few, while others may notice dozens. The presence of floaters alone is not typically a cause for concern unless they are accompanied by other symptoms, such as flashes of light or a sudden increase in their number, which could indicate a retinal tear or detachment. If you are experiencing anxiety about your floaters or any changes in your vision, it is advisable to consult with an eye care professional for a thorough evaluation.

In summary, while wide-angle imaging can be a useful tool in assessing retinal health without dilation, it is essential to have a comprehensive eye examination that may include dilation, especially given your history of high myopia and symptoms like flashes of light. Regular monitoring and communication with your ophthalmologist are crucial in managing your eye health and addressing any concerns you may have.

Similar Q&A

Comparing Non-Dilated Eye Exams to Traditional Dilated Checks

Hello, doctor. I have a myopia of -6.75 diopters, presbyopia, and mild astigmatism. Every year, I undergo dilated fundus examinations, as well as vision and intraocular pressure checks at an ophthalmology clinic. Today, I came across a type of fundus photography that does not req...

Dr. Gao Pilin reply Ophthalmology
Hello: Non-dilated fundus photography: This method typically uses specialized imaging equipment that can capture fundus images without the use of dilating agents. This may be more convenient for patients who need to quickly return to their daily work or activities. However, non-d...

Understanding the Differences Between Ultra-Widefield and Standard Eye Exams

What is the difference between ultra-widefield fundus photography and standard dilated eye examinations? Can it detect conditions such as glaucoma, retinal diseases, or visual field defects? Traditionally, high myopia has been assessed using dilation; if we switch to ultra-widefi...

Dr. Gao Pilin reply Ophthalmology
Hello: There are some differences between ultra-widefield fundus photography and standard dilated eye examinations in assessing eye health. Here are the main distinctions between the two and their capabilities in detecting specific eye diseases: 1. Field of View: - Ultra-wide...

Can Dilated Fundus Exam Detect Macular Degeneration in High Myopia?

Hello doctor, I have high myopia and I undergo dilated fundus examination every year to check my retina. May I ask if this examination can detect macular degeneration, or are there other methods to check for macular degeneration? What are the other methods? Thank you.

Dr. Gao Pilin reply Ophthalmology
Hello, A: You can self-check for macular degeneration using the Amsler grid. You can refer to the following link: https://bit.ly/3QFmMe7. During a dilated eye exam, the doctor will also examine the macula, and if there are any issues, additional tests will be arranged, so please ...

Understanding Retinal Scans: Do They Replace Traditional Eye Exams?

Dear Dr. Gao, I have high myopia (approximately -800 diopters) and therefore undergo regular retinal examinations. In April of this year, an ophthalmologist at a large hospital discovered that both of my eyes had a small area of retinal thinning, but no holes had formed yet. The...

Dr. Gao Pilin reply Ophthalmology
Hello, Xiang: The ultra-widefield fundus scanner provides a larger field of view than traditional dilated eye examinations and allows physicians to review the images more thoroughly, making it less likely to overlook lesions. Occasionally, symptoms of flashes may occur, ranging f...