Glaukos Gc-007 and Gc-008 Grandfather Certification Quiz - 2011

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The explanation for the given correct answer is that if the subject is able to read 19 letters or fewer at the 4M testing distance, it is recommended to conduct the testing at the 1M distance. This is because the subject's visual acuity is limited at the 4M distance, indicating potential vision impairment. By testing at the 1M distance, the examiner can obtain more accurate and reliable results using Chart 1 for the right eye and Chart 2 for the left eye. Therefore, the statement is true.

The correct answer is "4-meter, 1-meter". This means that according to the Glaukos VA Procedure Manual, the indicated room lanes required for the procedure are a 4-meter lane and a 1-meter lane.

This statement is true because if the subject is unable to read three or fewer letters at a distance of 4 meters, it indicates poor visual acuity. In order to accurately measure the subject's vision, they are moved closer to the chart, typically to a distance of 1 meter. This allows for better visual acuity and ensures that the subject can accurately read the letters on the chart. Refraction is then done at this closer distance to determine the appropriate corrective lenses, if needed.

The statement suggests that VA examiners do not need to be certified on an annual basis because their certification is valid for the duration of the trial. However, this statement is false. VA examiners do need to be certified on an annual basis as certification requirements may change over time and it is important for examiners to stay updated with the latest standards and guidelines.

If the subject has not been able to read any letters at 4M distance or the 1M distance, low vision testing should be performed. This indicates that the subject has significant difficulty with their vision and may require additional support or accommodations.

The correct answer is "All of the above" because completing all of the mentioned tasks is necessary for each VA Worksheet. It is important to circle the letters read correctly and calculate the total, cross out the letters attempted but read incorrectly and calculate the total, and leave the letters not read or attempted unmarked. Additionally, it is necessary to write down the manifest refraction findings and the entering and final Snellen VA. Therefore, all of the options mentioned above should be completed for each VA Worksheet.

The light meter should measure the room illumination to be less than or equal to 15 foot candles in order to perform study refractions and BSCVA testing.

Prior to testing at the 1M distance, two things need to be done. First, the insertion of a +0.75DS sphere to the 4M refraction findings is necessary. This is done to compensate for the increased convergence demand at the closer distance. Second, measuring the 1M distance with the 1M device is important to ensure accurate testing at that specific distance. Therefore, options B and C are the correct answers as they include both of these necessary steps.

The room illumination level should be checked and recorded on the Equipment Calibration Log (Form CR-00-046) prior to the start of the trial to ensure that the lighting conditions are suitable for the study. After the initial check, it should be monitored monthly thereafter to ensure that the illumination level remains consistent throughout the study. This periodic monitoring is important to maintain the accuracy and reliability of the study results.

The change in the cylinder component from +1.00DC to +2.00DC indicates an increase in astigmatism. To maintain spherical equivalence, the spherical component needs to be adjusted. Since the cylinder component has increased by 1.00DC, the spherical component should be adjusted by the same amount in the opposite direction. Therefore, the sphere lens should be changed to -1.50DS to maintain spherical equivalence.