GB1581835A - Fibre optic variable luminance perimetry wand - Google Patents
Fibre optic variable luminance perimetry wand Download PDFInfo
- Publication number
- GB1581835A GB1581835A GB4579776A GB4579776A GB1581835A GB 1581835 A GB1581835 A GB 1581835A GB 4579776 A GB4579776 A GB 4579776A GB 4579776 A GB4579776 A GB 4579776A GB 1581835 A GB1581835 A GB 1581835A
- Authority
- GB
- United Kingdom
- Prior art keywords
- fibre optic
- fibre
- perimetry
- wand
- light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
- A61B3/02—Subjective types, i.e. testing apparatus requiring the active assistance of the patient
- A61B3/024—Subjective types, i.e. testing apparatus requiring the active assistance of the patient for determining the visual field, e.g. perimeter types
Description
(54) THE FIBRE OPTIC VARIABLE
LUMINANCE PERIMETRY WAND
(71) I ALAN JAMES SPURRETT of
Hoyle House Farm Cottage Off Station Road,
Oakworth, Nr. Keighley, West Yorks., do hereby declare the invention, for which I pray that a patent may be granted to me, and the method by which it is to be performed, to be particularly described in and by the following state ment: The invention consists of the use of a thin fibre optic filament (1) to pipe light to a small spherical glass or plastic bead (2) which is used as a hand held perimetry target for plotting the extent of the visual field.
The fibre optic is housed in a metal tube (3)
2 mm diameter and approximately 70 cms. long
which is used as a perimetry wand. The
luminance of the target is varied by controlling
the light intensity entering the fibre, from the
light source (4), by means of two sheets of
polarising plastic, the axis of which may be ro
tated (5) and (6).
One of the polarisers (6) is fixed to the pentorch body (8) in front of the source and the other fixed to the wand's supporting collar (7) which is a squeeze fit on the pen torch body and which rotates with finger pressure.
The light source (4) is a small electric filament bulb which is housed in a pen torch handle (8) and is powered by either dry cell batteries or mains supply.
WHAT I CLAIM IS:
A device for plotting a patient's visual field,
comprising a fibre optic light guide on the end
of which is fixed a bead to emit light trans
mitted down the fibre optic, the fibre being
secured inside a tube, the tube being adapted te fit a pen torch and also containing two polaris
ing filters the relative position of which can be
suitably adjusted to control the intensity of
light passed into the fibre from the bulb in the
pen torch.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (1)
- **WARNING** start of CLMS field may overlap end of DESC **.(54) THE FIBRE OPTIC VARIABLE LUMINANCE PERIMETRY WAND (71) I ALAN JAMES SPURRETT of Hoyle House Farm Cottage Off Station Road, Oakworth, Nr. Keighley, West Yorks., do hereby declare the invention, for which I pray that a patent may be granted to me, and the method by which it is to be performed, to be particularly described in and by the following state ment: The invention consists of the use of a thin fibre optic filament (1) to pipe light to a small spherical glass or plastic bead (2) which is used as a hand held perimetry target for plotting the extent of the visual field.The fibre optic is housed in a metal tube (3)2 mm diameter and approximately 70 cms. long which is used as a perimetry wand. The luminance of the target is varied by controlling the light intensity entering the fibre, from the light source (4), by means of two sheets of polarising plastic, the axis of which may be ro tated (5) and (6).One of the polarisers (6) is fixed to the pentorch body (8) in front of the source and the other fixed to the wand's supporting collar (7) which is a squeeze fit on the pen torch body and which rotates with finger pressure.The light source (4) is a small electric filament bulb which is housed in a pen torch handle (8) and is powered by either dry cell batteries or mains supply.WHAT I CLAIM IS: A device for plotting a patient's visual field, comprising a fibre optic light guide on the end of which is fixed a bead to emit light trans mitted down the fibre optic, the fibre being secured inside a tube, the tube being adapted te fit a pen torch and also containing two polaris ing filters the relative position of which can be suitably adjusted to control the intensity of light passed into the fibre from the bulb in the pen torch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4579776A GB1581835A (en) | 1977-10-24 | 1977-10-24 | Fibre optic variable luminance perimetry wand |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4579776A GB1581835A (en) | 1977-10-24 | 1977-10-24 | Fibre optic variable luminance perimetry wand |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1581835A true GB1581835A (en) | 1980-12-31 |
Family
ID=10438645
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4579776A Expired GB1581835A (en) | 1977-10-24 | 1977-10-24 | Fibre optic variable luminance perimetry wand |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1581835A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7232304B2 (en) | 2003-03-10 | 2007-06-19 | Thomas Killion | Hobbyist-useable apparatus and method for fabricating decoratively-shaped writing instruments |
| US7448816B2 (en) | 2003-08-25 | 2008-11-11 | Thomas Killion | Display insert containing writing instrument |
| EP3620102A4 (en) * | 2018-04-03 | 2020-12-23 | Chen Lin | Perimeter |
-
1977
- 1977-10-24 GB GB4579776A patent/GB1581835A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7232304B2 (en) | 2003-03-10 | 2007-06-19 | Thomas Killion | Hobbyist-useable apparatus and method for fabricating decoratively-shaped writing instruments |
| US7448816B2 (en) | 2003-08-25 | 2008-11-11 | Thomas Killion | Display insert containing writing instrument |
| EP3620102A4 (en) * | 2018-04-03 | 2020-12-23 | Chen Lin | Perimeter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |