Term
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Definition
| means to view the angle. uses CLs that neutralize corneal refractive power and negates internal reflections of chamber angle. |
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Term
| Direct view on Gonioscopy uses |
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Definition
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Term
| what does the indirect view in gonioscopy use |
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Definition
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Term
| what is most frequently used for direct view and what type of image is produced |
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Definition
| Koeppe lens: 50D concave base lens with convex bubble-shape outer surface |
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Term
| which view is used more often and what kind of image is produced? |
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Definition
indirect view.
Image is inirect, virtual and unmagnified |
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Term
| what are the advantages of the indirect view in Gonioscopy? |
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Definition
uses an optic section to identify structures (eg: schwalbe's line)
- can vary magnification with slit lamp
- bright illumination from slit lamp allows to see samll details,
- easy implementation during examination,
- laser treatment
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Term
| Disadvantages of indirect |
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Definition
patient discomfort, small field of view and poor lateral view,
need fluid,
artifacts and corneal folds can sitort view, can have error in diagnosis secondary to pressure from the lens,
may produce anle opening or narrowing. |
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Term
| how to get improved view of angle recess with indirect view gonioscopy? |
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Definition
tilt the lens toward angle of observation and/or
have pt look toward the gonio mirror examiner is observing |
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Term
| How many times do you have to rotate a 1 mirror goldmann-style lens? |
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Definition
| rotate it 3 times to view entire angle |
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Term
| How many times do you have to rotate a 2 mirror goldmann-style lens? |
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Definition
| rotate it once to evaluate the whole angle |
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Term
| what are the advantages of 1 and 2 mirror lens? |
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Definition
- smaller lens (good for small aperture pt or squeezers)
- mirrors located closer to center of lens: this makes for a higher vantage point for angle observation and easier to see angle recess over bowed iris or natural angle.
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Term
| what are the advantages of the 4-mirror lens? |
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Definition
4 viewing mirrors means no lens rotation necessary.
- tear is the interface medium,
- smaller radius of curvature on CL-- more useful for indentaation
- quick assesment
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Term
| what are the disadvantages of the 4-mirror lens? |
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Definition
- requires steady hand and a lot of practice,
- distortion of normal angle configuration is possible,
- corneal folds are easily induced.
- no peripheral retinal examination capabilities.
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Term
what is the best choice for new to gonio people?
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Definition
goldmann 3 mirror lens:
Gonio soln helps to keep stability of lens position
angle structures less crowded, easier to differentiate. |
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Term
| What does the central mirror view in a 3-mirror lens? |
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Definition
view of central 30deg of posterior pol.
not inverted or reverse,
actual direct view |
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Term
| What does the trapezoid mirror view in a 3-mirror lens? |
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Definition
| equatorial region of retina with dilated patient |
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Term
| What does the rectangular mirror view in a 3-mirror lens? |
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Definition
| peripheral fundus anterior to equator (rectangle has 2 equal sides) with dilated pt |
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Term
| what does the thumbnail mirror show? |
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Definition
| view of angle (undilated)and ora seratta (dilated) |
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Term
| indications for gonioscopy |
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Definition
retinal evaluation (stereo view of pesterior pole through ora,
prob based test to view lesion seen with BIO.
dfe for uncorporative pt. |
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Term
| for the 3 way lens peripheral rectangular mirror what is difference between image and actual? |
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Definition
looking at mirror image so the views are inverted only!
(not inverted and reversed laterally like BIO) |
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