Objective: To evaluate the pattern of various types of visual field defects and their prevalence at initial examination of nonarteritic anterior ischemic optic neuropathy (NA-AION).Methods: The data were compiled from 312 consecutive eyes (in 265 patients)that fulfilled our inclusion and exclusion criteria. A comprehensive ophthalmic evaluation was performed, includingre cording of visual acuity, visual fields with a Goldmann perimeter (using I-2e, I-4e, and V-4e targets regularly), and intraocular pressure; slitlamp examination of the anterior segment;ophthalmoscopy; color fundus photography; and in acute cases, fluorescein fundus angiography. The visual field defects were divided into 2 groups: (1) general field defects and (2)-various types of scotoma in the central 30°. The prevalence of various types of visual field defects was estimated for I-2e, I-4e, and V-4e isopters by dividing the total number of eyes with thedefect by the total number of eyes that could see that particulartarget. Exact 95%confidence limits for the prevalence were computed. Results: Of the 265 patients, 169 (63.7%) were male and the mean±SD patient age was 55.0±9.1 years. The median interval between the first visual field test and the onset of NA-AION was 2 weeks. Of the 312 eyes, the I-2e target was seen by 75.3%, the I-4e target by 90.7%, and the V-4e targetby 100%. Overall prevalence of general visual field defects was 83.4%with I-2e, 78.8%with I-4e, and 68.9%with V-4e,whereas the prevalence of scotoma(s) within the central 30°was 55.3%, 49.5%, and 36.2%, respect ively. Central scotoma was seen in 48.5%with I-2e, 43.8%with I-4e, and 29.2%with V-4e. A detailed prevalence of various types of visualfield defects is given. Relative inferior altitudinal defect was most common (34.9%with I-2e and 22.3%with I-4e), but the absolute inferior altitudinal defect was seen in only 8.0%. Bycontrast, absolute inferior nasal sector visual loss was the most common defect detected in NA-AION (22.4%), but it occurredin only 3.4%with I-2e and 11.0%with I-4e. Overall, loss of the nasal part of the visual field was the most common occurrence. Conclusions: Our study demonstrated that NA-AION eyes may initially show a variety of optic nerve-related visual field defects. Our study also showed that an absolute inferiornasal visual field defect is much mo re common (22.4%) than an absolute inferior altitudinal visual field defect (8.0%) in NA-AION and could be considered the most characteristic singlefield defect in NA-AION. We found that a combination of relative inferior altitu dinal defect with absolute inferior nasal defect is usually the most common pattern inNA-AION. Objective: To evaluate the pattern of various types of visual field defects and their prevalence at initial examination of nonarteritic anterior ischemic optic neuropathy (NA-AION). Methods: The data were compiled from 312 consecutive eyes (in 265 patients) that fulfilled our inclusion A comprehensive ophthalmic evaluation was performed, including cording of visual acuity, visual fields with a Goldmann perimeter (using I-2e, I-4e, and V-4e targets regularly), and intraocular pressure; slitlamp examination of the anterior segment; ophthalmoscopy; color fundus photography; and in acute cases, fluorescein fundus angiography. The visual field defects were divided into 2 groups: (1) general field defects and (2) -various types of scotoma in the central 30 °. of various types of visual field defects was estimated for I-2e, I-4e, and V-4e isopters by dividing the total number of eyes with thedefect by the total number of eyes that could see that particular Target: Exact 95% confidence limits for the prevalence were computed. Results: Of the 265 patients, 169 (63.7%) were male and the mean ± SD patient age was 55.0 ± 9.1 years. The median interval between the first visual field test and The onset of NA-AION was 2 weeks. Of the 312 eyes, the I-2e target was seen by 75.3%, the I-4e target by 90.7%, and the V-4e targetby 100%. Overall prevalence of general visual field while the prevalence of scotoma (s) within the central 30 ° was 55.3%, 49.5%, and 36.2%, respect ively (83.4% with I-2e, 78.8% with I- 4e, and 68.9% with V- . Central inferior scoliosis was 48.5% with I-2e, 43.8% with I-4e, and 29.2% with V-4e. Bycontrast, absolute inferior nasal sector visual loss was the most common defect detected in NA-AION (22.4%) with I-2e and 22.3% with I-4e), but the absolute inferior was 20% , buOverall, loss of the nasal part of the visual field was the most common occurrence. Conclusions: Our study demonstrated that NA-AION eyes may initially appeared in a variety of optic nerve-related visual field defects. Our study also showed that an absolute inferior nasal visual field defect is much mo re common (22.4%) than an absolute inferior altitudinal visual field defects (8.0%) in NA-AION and could be considered the We found that a combination of relative inferior altitu dinal defect with absolute inferior nasal defect is usually the most common pattern in NA-AION.