Brief Answer:
These symptoms indicate
floaters.
Detailed Answer:
Hello
Welcome to Health care Magic
Iam Dr. Dadapeer K, an Ophthalmologist and I answer health problems related to eye.
I reviewed the history, for the last 3-4 years you are having symptoms of seeing lines every time you stare at bright clear source of light like sky.
This is typical of a condition seen commonly in clinical practice called as floaters.
Floaters are commonly seen in middle aged and in elderly individuals but they are seen sometimes in younger individuals also.
Floaters are because of changes in the vitreous a fluid gel present in the posterior segment of the eye behind the
lens. This vitreous is in gel form and as the age advances and sometimes without any specific reason also the vitreous starts to become liquid and in the course some part condenses and forms clumps, which cast their shadows on the retina and they are seen as floaters.
Hence the person sees zig zag lines of cob web appearance in the vision and they become very prominent when a person is looking at a bright surface like sky.
Most of the times the condition is unharmful and no treatment is required. However a examination is required for confirmation of diagnosis.
Floaters when associated with symptoms like flashes of light is a high risk sign as it may indicate
retinal tear.
If the floaters are really visually disturbing then treatment in the form of lasers to disrupt the clumps of the vitreous is available, but not followed by all the results are not satisfactory.
Hence I first advice you to
consult ophthalmologist preferably retinal specialist to look for floaters in the vitreous and advice accordingly.
Most of the times floaters are small hence they can be missed on examination, however the shadows from they can be big making the patient to see them clearly. This may be the reason for missing the floaters on examination by doctors.
Hence this may require repeated examination to find out the floaters.
As you have mentioned that you do not have headache associated with floaters, this rules out
migraine as similar prodromal symptoms are present in migraine.
Hope I have answered your query and the information is helpful to you.
Thank you