Correction of Hyperopia and Astigmatism
Hello, doctor.
The child underwent a dilated eye exam and both eyes were found to have hyperopia of +2.00 diopters and astigmatism of -1.75 diopters.
The uncorrected visual acuity was approximately 0.8 in the left eye and 0.6 in the right eye.
After wearing glasses, the visual acuity in both eyes is about 0.4 to 0.5.
Is this normal? The staff at the affiliated optical shop explained that because the child has hyperopia, correcting the astigmatism simultaneously consumes the hyperopic vision (without other corrective measures, such as occlusion), in order to achieve a normal visual acuity of about 1.0.
They also mentioned that it is normal for the child to see unclear initially after starting to wear glasses and suggested a follow-up examination in a month.
However, logically, shouldn't wearing glasses improve clarity? Why is it that vision is more blurred after wearing them, and only becomes clearer after prolonged use? Is the optical shop's explanation correct?
Feng Baba, 30~39 year old female. Ask Date: 2021/03/29
Dr. Gao Pilin reply Ophthalmology
Hello, Mr.
Feng:
For individuals with hyperopia (farsightedness), the ciliary muscles must work harder to focus on objects, which means that without corrective lenses, the eyes are in a strained state.
When wearing hyperopic glasses, the ciliary muscles should relax.
If they are unable to relax immediately, one might experience some blurriness.
However, after wearing the glasses for a while and allowing the eyes to relax, vision should become clearer.
It is important to have an eye examination by an ophthalmologist to ensure that the prescribed glasses are correct.
At Taiwan E-Hospital Puzi Hospital, the ophthalmology department is open:
Monday, Tuesday, Thursday, and Friday from 8:00 AM to 12:00 PM
Wednesday from 2:00 PM to 4:30 PM
Please note that online responses are for reference only, and it is necessary to seek medical attention at a healthcare facility if needed.
I hope to have the opportunity to assist you.
Best regards,
Gao Pilin
Reply Date: 2021/03/29
More Info
Understanding hyperopia (farsightedness) and astigmatism in children is crucial for ensuring their visual health and development. In your case, your child has been diagnosed with hyperopia of +2.00 diopters and astigmatism of -1.75 diopters. The uncorrected visual acuity is 0.8 in the left eye and 0.6 in the right eye, while the corrected vision with glasses is around 0.4 to 0.5.
Firstly, it is important to understand that hyperopia means that distant objects may be seen more clearly than near objects, but it can also lead to difficulty focusing on objects at all distances, especially in children. Astigmatism, on the other hand, is caused by an irregular curvature of the cornea or lens, leading to blurred or distorted vision at all distances.
When children have both hyperopia and astigmatism, the correction of these refractive errors can sometimes lead to initial discomfort or a temporary decrease in visual acuity. This is particularly true if the child is not accustomed to wearing glasses. The explanation provided by the optical staff at the clinic—that correcting astigmatism may initially consume some of the hyperopic vision—can be somewhat misleading. In reality, the goal of corrective lenses is to provide clearer vision by compensating for the eye's refractive errors.
It is not uncommon for children to experience a period of adjustment when they first start wearing glasses. This adjustment period can involve a few days to weeks where the child may feel that their vision is not as clear as expected. This can be due to several factors, including the strength of the prescription, the child's adaptation to the lenses, and the need for the brain to adjust to the new visual input.
The recommendation to wait a month before re-evaluating is standard practice, as it allows time for the child to adapt to the new glasses. However, if the child continues to experience significant blurriness or discomfort after this period, it is essential to return to the eye care professional for a follow-up examination.
In terms of visual acuity, achieving 1.0 (or 20/20) vision is often the goal, but it is also important to consider the individual child's needs and comfort. If the child is still struggling to see clearly with the glasses, it may indicate that the prescription needs to be adjusted or that there are other underlying issues that need to be addressed.
In summary, while it is normal for children to take some time to adjust to new glasses, persistent issues with clarity should be evaluated further. Regular follow-ups with an eye care professional are crucial to ensure that the child’s vision is developing appropriately and that any necessary adjustments to their prescription are made in a timely manner. Additionally, monitoring the child's visual development and ensuring they are comfortable with their glasses will help promote a positive experience with vision correction.
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