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Ophthalmic Lens Measurement and Visual Field Testing, Exams of Optics

Northern Virginia Community CollegeOptics

A comprehensive study guide for the opt 160 course, covering various topics related to ophthalmic lens measurement and visual field testing. It includes detailed information on neutralization, ophthalmic notation, lens types, lensometry, prescription transposition, and visual acuity testing. Additionally, the guide covers visual field testing techniques, such as perimetry, goldmann perimetry, humphrey field analyzer, and tangent screen exams. The document also addresses common issues and best practices for conducting these tests, including patient cooperation, calibration, and troubleshooting. This study guide is designed to provide students with a thorough understanding of the concepts and procedures involved in measuring and evaluating ophthalmic lenses and visual fields, making it a valuable resource for those pursuing a career in the field of optometry or ophthalmology.

Typology: Exams

2023/2024

Available from 08/16/2024

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OPT 160 Study Guide | 100% Correct
Answers | Verified | Latest 2024 Version
_____________ is a procedure designed to measure the prescription in spectacle lenses. -
✔✔Neutralization
In ophthalmic notation, OU stands for ____________. - ✔✔Both eyes
A plano lens _______________. - ✔✔Has no refractive power
Which of the following is correct regarding lensometry?
A. It determines the power of a lens.
B. It determines the direction of a prism.
C. It determines if there is cylindrical power present.
D. All the choices stated above are correct. - ✔✔D. All the choices stated above are correct.
A "plus" lens is also known as a _________ lens. - ✔✔Convex
Which of the following is a prescription for a patient with myopia and astigmatism? - ✔✔-1.00+0.50
X120
Transpose the following prescription: +3.00-1.00 X60 - ✔✔+2.00+1.00 X150
If the closely-spaced triple lines appear broken when looking through the eye-piece of a lens meter, you
need to _______________. - ✔✔Rotate the axis wheel at the same time as you adjust the power drum.
When using a lens meter, the first thing you must do is ___________. - ✔✔Focus the eyepiece.
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OPT 160 Study Guide | 100% Correct

Answers | Verified | Latest 2024 Version

_____________ is a procedure designed to measure the prescription in spectacle lenses. - ✔✔Neutralization In ophthalmic notation, OU stands for ____________. - ✔✔Both eyes A plano lens _______________. - ✔✔Has no refractive power Which of the following is correct regarding lensometry? A. It determines the power of a lens. B. It determines the direction of a prism. C. It determines if there is cylindrical power present. D. All the choices stated above are correct. - ✔✔D. All the choices stated above are correct. A "plus" lens is also known as a _________ lens. - ✔✔Convex Which of the following is a prescription for a patient with myopia and astigmatism? - ✔✔-1.00+0. X Transpose the following prescription: +3.00-1.00 X60 - ✔✔+2.00+1.00 X If the closely-spaced triple lines appear broken when looking through the eye-piece of a lens meter, you need to _______________. - ✔✔Rotate the axis wheel at the same time as you adjust the power drum. When using a lens meter, the first thing you must do is ___________. - ✔✔Focus the eyepiece.

If all lines come into focus simultaneously, when rotating the power drum, the lens is a _____________. - ✔✔Spherical lens The reading on the power drum is - 0.75. The second reading is +1.50. The power of the plus cylinder is _________. - ✔✔+2. While measuring the bifocal add, the power drum reading is +1.00. The corresponding lines, in the original sphere reading, were sharp at - 1.75. The bifocal add power is _________? - ✔✔+2. The point in a lens where no refraction, of incident light rays, occurs is called ___________. - ✔✔The focal point When transposing lens prescriptions the axis may not exceed __________. - ✔✔180 degrees Myopia is also called ___________. - ✔✔Nearsightedness A unit of measurement that expresses the refractive power of a lens is __________. - ✔✔Diopter A concave lens is a lens whose surface is __________. - ✔✔Curved Inward A ___________ lens is used to correct astigmatism. - ✔✔Cylindrial lens Astigmatism produces a refractive error due to __________. - ✔✔Unequal refraction along two meridians. By convention, ________ is usually tested first for visual acuity. - ✔✔OD (right eye) The standard testing distance for near vision (NVA) is - ✔✔ 14 - 16 inches (35-40 cm) If you test near vision with correction, abbreviate it as ________. - ✔✔NVcc or J/c

On a Goldmann Perimeter, it is possible to measure...... - ✔✔both the central and peripheral visual field. What Humphrey Field Analyzer test is recommended for early to moderate glaucoma patients? - ✔✔Threshold 30-2 or 24- 2 A Tangent Screen exam is performed at a distance of - ✔✔ 1 - 2 meters from the screen. The normal blind spot on a Tangent Screen is approximately 15 degrees from fixation on the - ✔✔temporal side of the chart. The fraction 5/1000 means the target was 5mm and the testing distance was __________mm. - ✔✔ 1000 The Amsler Chart or grid tests abnormalities within the... - ✔✔Central 20 degrees of the field. What instrument has a telescope for monitoring patient fixation during the visual field test? - ✔✔Goldmann perimeter. For the Humphrey Field Analyzer, use a +3.00 add if - ✔✔The patient is aphasic or dilated. If a patient fails to respond to the brightest light stimulus in automated testing, you should...... - ✔✔Change to a larger stimulus size and try again. Many false positive responses occur when.... - ✔✔The patient is trigger happy. The patient will not cooperate with you during the field test. What do you do? - ✔✔Finish the test but write a note to the physician.