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Titmus V4 / Titmus V2
Operation of the Vision Screener (continued)
Operating the Far/Near Lever
1. Operator is seated on the right side of the instrument.
2. To move the lever from FAR to NEAR and back, move the lever as shown.
FAR VISION TESTING (20 feet) NEAR VISION TESTING (14”)
For Near Vision Testing:
This applies especially for patients who wear bifocals, multifocals or progressive lenses.
1. Ask the patient to place hands on the instrument as shown.
2. Ask patient to use thumbs to raise glasses until he/she is viewing the slide through the
proper part of his/her lens for reading.
3. Ensure that the patient is comfortable.
Intermediate Vision Testing & Using Plus Lens
• Ensure lever is in FAR position. Place lens in the
holder.
• The lens must be inserted in the slot with the label
facing the front of the instrument.
• Perform test.
• REMOVE lens upon completion of test.
CAUTION: Do not turn the FAR/NEAR lever while
the lens is in the instrument. This may damage
the instrument.
Using Plus Lens:
The plus lens must be inserted in the slot with the label
facing the front of the instrument.
• The Plus Lens, +1.75, is used with the Acuity Test
for children. Other plus lenses are also available as
optional accessories.
• Standard testing procedure requires that acuity test is administered first. If child demonstrates poor visual acuity
(20/40), it is unnecessary to administer the Plus Lens Test. If the child demonstrates 20/30 or 20/20, administer
the Plus Lens Test.
• Children with normal vision will be unable to read the 20/20 line through the Plus Lens. If a child can read the
20/20 line through the Plus Lens, then result is FAIL. Blurred vision through Plus Lens is normal, clear distance
vision is abnormal and can indicate excessive farsightedness. This test is very important for school age children.
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