Instruction Manual PUBLICATION NO.
Contents The DVS-V Test Instrument. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 DVS-V Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 The Elliptech Hand Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3 Test Guide. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The DVS-V Test Instrument The Keystone DVS-V Vision Screener represents the fifth generation of electro/mechanical vision test instruments. All functions are under push button control… for unparalleled ease and reliability of operation. Completely self contained, the unit operates from standard 110-120 volt AC power. It’s light in weight, unusually compact, and can go wherever it’s needed. that virtually assure that the lamps will never fail or need to be changed during the life of the machine.
DVS-V Maintenance Under normal conditions of use, the DVS-V will require little maintenance if it is protected by a dust cover when not in use. Virtually no repair or adjustment will be needed, since all operating component are protected and solid-state circuitry assures exceptionally high reliability. Cleaning Periodically, some cleaning will be necessary.
Elliptech Control Unit The newly designed DVS-V Elliptech Soft-Touch hand control unit makes for easy operations of the vision screener. By pressing the appropriate buttons on this compact panel, the stereo tests can be advanced or reversed, the subject’s eyes occluded, and the peripheral vision test lamps selectively lit. The comfortable design makes it suitable for either hand-held or desk-top operation. C B D A E F A) Occlusion is controlled by pushing separate buttons for each eye.
Test Guide Subject to wear any glasses normally used when driving. Test #1: Quick Acuity Nine separate blocks containing three digits of 20/40 acuity letters each. The first column tests both eyes, the second tests right eye acuity, and the third test left eye acuity. All three lines should be read, and only as many as two digits in each column can be misread without failure. Note that we are testing both monocular and binocular vision in one test presentation. The acuity level presented is 20/40.
Test Questions and Referral Guide Notes: All tests are given with both eyes open at all times. Subject to wear any glasses normally used for driving. Test #1 Quick Acuity at 20/40 Level Actual Test QUICK ACUITY TEST BOTH RIGHT LEFT 1. 958 479 823 2. 347 563 268 3. 426 728 534 Ask your subject: “ Do you see three columns with numbers?” “Look at the first column, starting from top to bottom, please read the digits to me.
Test #3 & #4 Depth Perception & Sign Recognition Actual Test 1. STOP (NEAR) 2. MERGE 3. NO LEFT TURN DEPTH / SIGNS 4. ROAD CLOSED 5. HANDICAPPED (FAR) 6. SIGNAL AHEAD Ask the subject: “Please identify all six road signs. What do they mean?” “Do any appear closer to you than the others?” “Which one?” “Do any appear further away from you?” “Which?” Actual Test DEPTH / SIGNS 7. NO RIGHT TURN 10. SCHOOL (FAR) 8. RAILROAD (NEAR) 11. REGULATORY 9. YIELD 12.
Test #5 Binocular Acuity Actual Test A B C 1. 20 = 857432 25 = 674235 30 = 382457 2. 40 = 563472 50 = 859423 60 = 8927 3. 70 = 2978 100 = 43 200 = 9 Note: Double Check the day/nite switch for desired position. Ask your subject to read the first block of characters, Column A. If they are read correctly, he/she has 20/20 acuity, and they need not read any further. Five of six characters must be read.
Test #7: Left Eye Acuity Actual Test A B C 1. 20 = 745932 25 = 578236 30 = 346752 2. 40 = 534268 50 = 752386 60 = 6254 3. 70 = 8453 100 = 85 200 = 3 Proceed as on test #5 and #6. To pass the acuity test, at least five of six characters must be read in Blocks A, Line 2 on each of the tests 5,6, and 7. This is a standard of 20/40 for each eye separately, and both eyes together. This standard corresponds to most State requirements.
Horizontal Field Testing HORIZONTAL FIELD LEFT SIDE 85° 70° 55° RIGHT SIDE NASAL NASAL 55° 70° 85° This test shows a subject's range of vision to each side when he/she looks straight ahead. Having the subject direct his/her attention to a far-point stereo target and then lighting the peripheral target lamps at random. The stereo target used should be a simple binocular target. Tell the subject to continue looking at the numbered circles of the color vision target.
2200 Dickerson Road, Reno NV 89503 Phone: (775) 324-2799 (800) 806-6569 Fax: (775) 324-5375 Email: saIes@keystoneview.
