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Static Perimetry

Eye Care estimated about CNY 300-650

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Description

A clinical test that measures the visual field by determining the dimmest light stimulus a patient can detect at various retinal locations, using a fixed stimulus presentation method.

Main Uses

Primary use is objective, quantitative assessment of retinal ganglion cell function for early detection and longitudinal monitoring of glaucoma; also used to diagnose and characterize neuro-ophthalmic disorders (e.g., optic nerve, chiasmal, or retrochiasmal lesions), evaluate visual field defects in stroke, multiple sclerosis, brain tumors, and inherited retinal diseases; assess functional impact of diabetic retinopathy or macular degeneration; and support disability evaluations or driver’s license eligibility assessments.

Normal Range

Static threshold perimetry (e.g., Humphrey Visual Field Analyzer) reports results as sensitivity thresholds (in decibels, dB) at each test point. Normal age-corrected total deviation (TD) and pattern deviation (PD) values typically fall within ±2 dB across the central 30° visual field; mean deviation (MD) should be ≥ −2.0 dB (often −0.5 to +1.0 dB in healthy adults aged 20–60); pattern standard deviation (PSD) should be ≤ 2.0 dB; glaucoma hemifield test (GHT) must be 'within normal limits'. Fixation losses <20%, false-positive errors <15%, and false-negative errors <15% indicate reliable testing.

Low Values - Possible Causes

Glaucomatous optic neuropathy, retinitis pigmentosa, ischemic optic neuropathy (e.g., NAION), advanced diabetic retinopathy with macular edema or optic atrophy, chiasmal compression (e.g., pituitary adenoma causing bitemporal hemianopia), optic neuritis, stroke affecting visual pathways (e.g., occipital lobe infarction), hereditary optic neuropathies (e.g., Leber’s hereditary optic neuropathy).

High Values - Possible Causes

High values are not clinically meaningful in static threshold perimetry — sensitivity thresholds (dB) represent detection ability, so higher dB = better function; thus, 'high' values reflect normal or supranormal sensitivity and are not pathologic. Artifactual 'high' readings may arise from patient inattention (leading to false negatives misinterpreted as high thresholds), improper calibration, lens-induced blur, or excessive pupil constriction during testing. True pathological elevation does not occur; instead, abnormally elevated MD/PSD values beyond age norms suggest test unreliability or technical error.

static threshold perimetry visual field test glaucoma screening test

estimated about CNY 300-650