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Relationship between visual acuity and nasal field thresholds in patients with temporal hemianopia
1Department of Ophthalmology, Beilinson Medical Center, Petah Tikva, Israel.
Journal of Clinical Neuro-Ophthalmology
|March 1, 1991
Summary
Early nasal field loss, detected by Goldmann and Humphrey perimetry, is linked to chiasmatic lesions and temporal field loss, especially when visual acuity declines. This indicates the initial stage of nasal field impairment.
Area of Science:
- Ophthalmology
- Neuro-ophthalmology
- Visual field testing
Background:
- Visual field defects can indicate underlying neurological or ocular conditions.
- Chiasmatic lesions and temporal field loss are significant visual impairments.
- Early detection of visual field changes is crucial for timely intervention.
Purpose of the Study:
- To investigate nasal visual field changes in patients with chiasmatic lesions and temporal field loss.
- To correlate visual field parameters with visual acuity in these patient groups.
Main Methods:
- Utilized Goldmann static perimetry to assess the area of the nasal field.
- Employed Humphrey threshold 30/2 perimetry to measure the sum of decibels in the nasal field.
- Compared findings in normal subjects with those having chiasmatic lesions or temporal field loss.
Main Results:
- Patients with temporal field loss and chiasmatic lesions showed a significant reduction in nasal field area (Goldmann) and nasal field decibels (Humphrey) compared to controls.
- Significant correlations were found between nasal field depression (Goldmann) and visual acuity.
- Significant correlations were also observed between sums of nasal field decibels (Humphrey) and visual acuity.
Conclusions:
- A generally depressed nasal field is characteristic of chiasmatic lesions and temporal field loss, particularly when accompanied by reduced visual acuity.
- This nasal field depression may represent the earliest stage of nasal field involvement in these conditions.