Tender For H-380- %U201chrn%U201d Landolt%U2019s %U201cc%U201d Ring Board, solapur-Maharashtra

Supply Of H-380- %U201chrn%U201d Landolt%U2019s %U201cc%U201d Ring Board Test Equipment With Night Vision Blindness Test Arrangement: Only Hrn Landolt%U2019s %U201cc%U201d Ring Board Test Is Approved By India Railways For Eye & Vision Medical Examination. The Test Objects Are Mounted On Black Sand Papered Dull Black Board Box Of Approx 60Cm Long X 22Cm Wide X 1.5Mm Thick Which May Be Kept On Table. The Rear Of The Box Board Is Provided With Cover Where Shanks Of Eight Rings Stricks Are Located To Carry The Series Of Tests. Eight Landolt%U2019s Test Objects Of The Following Sizes Are Mounted On Acrylic Disc. Objects Are Covered With Dull Black Covers Which May Be Removed Only At The Time Of Examination: 6 / 60, 6 / 36, 6 / 24, 6 / 18, 6 / 12, 6 / 9, 6 / 6, 6 / 5 Illumination: The Test Objects Are Illuminated To Provide Illumination Within 5 Feet Uniformly. The Source Of Light Is Shaded & Is Not Visible Either To The Examinee Or To The Examiner. The Test Board Is Illuminated By Two 20 Watts Day Light Fluorescent Tubes On Either Side Of The Board. One Tube Light Is Fixed In Left Hand & Another Fixed On Right Hand. Fitted With Night Vision Blindness Test With 2 Bulbs Fixed Both Side Of Examination Board, One Above And One Below. The Night Vision Blindness Test Is Attached To A Rheostat To Reduce Or Increase Intensity Of Light Required On Landolt%U2019s Board. Both Tubes Lights & Bulbs Are Controlled By Power-Board Which Consists Of The On / Off Switch & Rheostat To Control The Intensity Of Light Of Bulbs. Specification: Hrn Modified & Improved Landolt%U2019s %U201cc%U201d Ring Board Test. Standard Test Object Consisting Of 8 Series Of Matt Black Ring On Acrylic Plastic Sheet. Each Ring Is Broken By A Radial & Parallel Sided Gap, The Width Of Which Taken Tangentially To The Ring, Is In All Cases Equal To The Radial Breadth Of The Ring, The Gap Or Split In The Ring Is Accordingly A Square. The Overall Diameter Of The Ring, From Outer Margin To Outer Margin, Is Five Times The Width Of The Gap. Test Objects Are Mounted On Teak Board. From The Rear Of Board, The Studs Are Rotatable. Sliding Covers Are Provided On Both Sides Of %U201cc%U201d Ring Board. The Measurement Of The 8 Rings Required & The Equivalence Of The Various Members Of The Series With Snellen%U2019s Test Type For Distance Are As Thus: S No. No. Of Snellen Equivalent Width Of Gap In Millimeters Outer Radius Of Ring In Millimeters Inner Radius Of Ring In Millimeters 1. 6 / 60 17.45 43.62 26.17 2. 6 / 36 10.47 26.17 15.69 3. 6 / 24 6.94 17.45 10.47 4. 6 / 18 5.23 13.09 7.85 5. 6 / 12 3.49 8.72 5.23 6. 6 / 9 2.61 6.54 3.92 7. 6 / 6 1.74 4.36 2.61 8. 6 / 5 1.45 3.63 2.18 Complete Hrn Landolt%U2019s Board Is In Black Finish With Opening On Either Side With Opening And Operating %U201cc%U201d Rings From The Back. The Individual Matching Black Colored Discs Are Provided To Cover Each Ring. As Per Railways Specifications Supplied Complete With Connecting Cable To Work On 220 Volts A / C Mains. Manual Will Be Supplied With Each Unit. [ Warranty Period: 12 Months After The Date Of Delivery ]

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