Tangent Screen
Overview
Product sourcing insights & recommendations
The 'tangent screen' is a specialized ophthalmic diagnostic tool primarily used for detecting functional visual loss (FVL) and evaluating visual field defects caused by ptosis. While it is a traditional manual perimetry method, it remains the "gold standard" for identifying non-physiologic defects through variable distance testing and the Tangent Ratio (TR).
The broader visual field testing market is currently evolving toward portable VR-based headsets and AI-integrated diagnostics, with the market projected to reach $980 million by 2032. Despite this, the tangent screen's extreme cost-effectiveness (approx. $250 vs. $13,000+ for automated units) and fast testing times (6 mins vs. 15+ mins) maintain its niche in modern optometry.
I have compiled a detailed report that covers technical diagnostic patterns (like the Cloverleaf and Reversal patterns), global market growth projections for 2026, and a comparison with modern automated perimeters. The report also includes direct sourcing links for top-rated visual field analyzers.
Based on the report findings, would you like to:
Automated Visual Field Analyzer Perimetry
Products · 2 lists
Integrated Auto Perimeter APS-6000CER Ophthalmic Equipment Visual Field Analyzer Auto Perimeter With Built-in Computer
Shenzhen Holya Vision Optical Industrial Co.,Ltd🇨🇳CN7 yrs
APS-T00 Ophthalmic Equipment Automatic Perimeter Humphrey Visual Field Analyzer
Medsinglong Co., Ltd.verified🇨🇳CN12 yrs
Longermay Auto Computerized Ophthalmology Equipment Perimeter Visual Field Analyzer
Nantong Longer Med Technology Co., Ltd.verified🇨🇳CN6 yrs
China Small Size Ophthalmology Ophthalmic Automatic Perimeter Visual Field Analyzer Machine BIO-1000 Without Printer
Shanghai Top View Industrial Co., Ltd.verified🇨🇳CN14 yrs
Aist Optics BIO-1000 CE ISO Ophthalmic Visual Field Screening Machine Automated Visual Field Auto Perimeter
Shenzhen Aist Industrial Co., Ltd.🇨🇳CN6 yrs
APS-T00 Ophthalmic Equipment Automatic Perimeter Humphrey Visual Field Analyzer
Medsinglong Co Ltdverified🇨🇳CN8 yrs
BIO-1000 Ophthalmology Auto Perimeter Visual Field Analyzer Electric Eye Exam Equipment for Eye Clinic
Visualtech (Shanghai) Corporationverified🇨🇳CN3 yrs
CE ISO Automated Ophthalmic Visual Field Screening Machine Visual Field Analyzer Perimeter
Nanjing Healicom Medical Equipment Co., Ltd.verified🇨🇳CN16 yrs
Personalized Design Automatic Visual Field Analyzer Ophthalmic Computer Perimeter With Software
Sichuan Sinome Co., Ltd.verified🇨🇳CN5 yrs
New Design Ophthalmic Automated Perimetry Test Machine Computerized Visual Field Analyzer
Nanjing Healicom Medical Equipment Co., Ltd.verified🇨🇳CN6 yrs
APS-T00 Ophthalmic Equipment Automatic Perimeter Humphrey Visual Field Analyzer
MEDSINGLONG CO LTDverified🇨🇳CN13 yrs
SVF-7000 Ophthalmology Eye Field Test Machine Automatic Visual Field Analyzer Projection Perimeter
Luminous Vision Co., Ltd.🇨🇳CN2 yrs
Automatic Perimeter Device Projection Perimeter BIO-1100 BIO-1000 Auto Perimeter Humphrey Visual Field Analyzer
Shanghai Gogo Vision Co., Ltd.🇨🇳CN3 yrs
APS-T00 Multi-function Ophthalmic Auto Perimeter Visual Field Analyzer
Shanghai Link Instruments Co., Ltd.verified🇨🇳CN16 yrs
Ophthalmic Equipment Automated Perimeter Automatic Visual Field Analyzer Auto Perimeter for Perimetry test
Beijing Hongdee Corporationverified🇨🇳CN9 yrs
Internationally Certified Ophthalmic Instruments BIO-1000 Automatic Computer Perimeter Ophthalmic Visual Field Analyzer
Shanghai Weisixin Precision Instrument Co., Ltd.🇨🇳CN1 yr
Ophthalmic Perimeter Equipment BIO-1000 Auto Perimetry Visual Field Analyser for Eye Examination
Chongqing Vision Star Optical Co., Ltd.verified🇨🇳CN11 yrs
APS-T00 Ophthalmic Equipment Automatic Perimeter Humphrey Visual Field Analyzer
MEDSINGLONG CO LTDverified🇨🇳CN6 yrs
WELLSIGHT IVS-210A China Ophthalmology Visual Field Analyzer Automatic Perimeter 18-Month Warranty 110/220V Plastic Metal Glass
Shanghai WellSight Tech Co., Ltd.🇨🇳CN1 yr
SY-V020-1 Ophthalmic Auto Equipment Computer Eye Perimeter Visual Field Analyzer
Sunny Medical Equipment Limitedverified🇨🇳CN12 yrs
Wincom VFA-1000 High Quality Visual Field Analyzer Auto Perimeter Ophthalmic Instrument
Wincom Company Ltd.verified🇨🇳CN18 yrs
APS-TOO China Ophthalmic Equipment Humphrey Auto Perimeter Visual Field Analyzer
Nanjing Redsun Optical Co., Ltd.🇨🇳CN15 yrs
InnoVue Opto BIO-1000 Auto Perimeter High Precision Multi-Mode Computer Visual Field Analyzer for Ophthalmic Diagnostic
Chongqing Innovue Optical Technology Co., Ltd.🇨🇳CN1 yr
Automatic Computer Perimeter Pupil Diameter Measurement Visual Field Analyzer High Quality Ophthalmic Perimeter
Sichuan Mkr Co., Ltd.verified🇨🇳CN7 yrsDeep Dive · Full Report
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Sources & References
26 sources cited · Verified industry data & reports
Tangent screen perimetry in the evaluation of visual field ...
PubMed Central (PMC) (.gov)
Tangent visual fields are a rapid and inexpensive way to test for functional loss of superior visual field in patients with upper eyelid malposition.
Visual field
UCSF Health
Tangent screen or Goldmann field exam. You will sit about 3 feet (90 ... Both tests are often used to track conditions that may worsen over time, ...
Tangent visual field test
American Academy of Ophthalmology
The tangent visual field test at 1 and 2 meters (m). The visual field normally expands on increasing the testing distance from 1 to 2 m.
Grid for Scoring Visual Fields: I. Tangent Screen
JAMA
A device is presented for quantitative evaluation of visual fields analagous to what is done for central acuity by the Snellen test. It consists of a grid.
Tangent Screen Guide
Opentip.com
Tangent Screens are used to develop a map of a patient's visual field. This map can then be used to diagnose various disease conditions of the eye including ...
Visual Field Testing Periprocedural Care
Medscape
The tangent screen consists of a black screen that is placed in front of the patient. The examiner presents pins as the stimuli, in front of the ...