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Bilateral monocular diplopia associated with lid position during near work
J G Ford1, R M Davis, J W Reed
1Department of Ophthalmology, Wake Forest University Eye Center, Winston-Salem, NC 27157-1033, USA.
Cornea
|September 19, 1997
Summary
Reading can cause monocular diplopia due to corneal topographic changes. These alterations, linked to lid position and tear film, affect vision after near work.
Area of Science:
- Ophthalmology
- Corneal topography
- Vision science
Background:
- Monocular diplopia after reading is a visual disturbance affecting some individuals.
- The underlying causes of reading-induced monocular diplopia require further investigation.
Purpose of the Study:
- To characterize topographic changes and clinical signs in patients experiencing monocular diplopia post-reading.
- To identify the cause of these corneal topographic disturbances.
Main Methods:
- Videokeratoscopic examination and red reflex examination were performed on six patients with monocular diplopia and 20 controls.
- Examinations were conducted before and after a 30-minute reading period.
- Analysis included keratoscopic ring inspection, topography map assessment, and comparison of surface asymmetry (SAI) and surface regularity (SRI) indices.
Main Results:
- Half of the patients developed subtle corneal ring distortions after reading, unlike controls.
- Significant increases in SAI and SRI were observed in patients, indicating focal distortions.
- Patients showed horizontal red reflex bands and narrower interpalpebral fissures in down gaze post-reading.
Conclusions:
- Corneal topographic alterations can occur during near work, leading to monocular diplopia.
- These changes are hypothesized to be related to eyelid position and tear film dynamics on the corneal surface.