Normal visual fields as assessed by computerized static threshold perimetry in patients with untreated primary hypothyroidism

1989 ◽  
Vol 121 (4) ◽  
pp. 495-500 ◽  
Author(s):  
Bengt Hallengren ◽  
Per Manhem ◽  
Margareta Bramnert ◽  
Inga Redlund-Johnell ◽  
Anders Heijl
Keyword(s):  
Visual Field ◽  
Prospective Study ◽  
Visual Fields ◽  
Primary Hypothyroidism ◽  
Common Finding ◽  
Visual Field Defects ◽  
Computer Assisted ◽  
Computerized Perimetry ◽  
Assisted Analysis ◽  
Field Defects

Abstract. In this prospective study, 25 consecutive patients with untreated primary hypothyroidism were tested with a highly sensitive perimetric technique, since a high prevalence of visual field defects has been described in this condition. All patients had clinical hypothyroidism, a serum TSH value > 20 mU/l (reference range 0.4–4.0) and decreased/low normal serum total T4 concentration. Visual fields were tested with fully automated threshold-measuring computerized perimetry of the central 30 degrees field. Interpretation of fields included computer-assisted analysis provided by a perimetric statistical programme package. In 23 patients, conventional inspection and computer-assisted analysis showed no visual field defects. Two patients were excluded from the latter analysis: one patient who did not respond adequately at computerized perimetry and in whom manual field tests were entirely normal; one patient who had low sensitivity values in the uppermost parts of both visual fields owing to markedly swollen upper eye lids. In conclusion, although pituitary hyperplasia has been well documented in primary hypothyroidism, the present prospective study clearly indicates that visual field defects are not a common finding in patients with this disease.

Influence of Carteolol and Timolol on IOP and Visual Fields in Glaucoma: A Multi-Center, Double-Masked, Prospective Study

1992 ◽  
Vol 2 (4) ◽  
pp. 169-174 ◽  
Author(s):  
J. Flammer ◽  
Y. Kitazawa ◽  
L. Bonomi ◽  
B. Mills ◽  
M. Fsadni ◽  
...  
Keyword(s):  
Visual Field ◽  
Prospective Study ◽  
Beta Blockers ◽  
Visual Fields ◽  
Visual Field Defects ◽  
Eye Drops ◽  
Treatment Groups ◽  
Visual Field Damage ◽  
One Year ◽  
Field Defects

The influences of Carteolol and Timolol eye drops on intraocular pressure (IOP) and visual fields were compared in a multi-center, double-masked, prospective study. Two-hundred and forty eyes of 120 patients were initially included in the study, and 142 eyes of 72 patients fulfilled all the criteria for final statistical analysis. Both drugs significantly reduced IOP. The visual fields in both treatment groups did not change during one year of treatment. In both groups some patients improved slightly, and others deteriorated slightly. This indicates that locally applied beta-blockers may efficiently stop further progression of visual field defects in cases with increased IOP and early visual field damage. There was no difference between Carteolol and Timolol in this regard. The side effects were minimal, and there were no differences in their frequency or intensity in the two treatment groups.

Reading with Visual Field Defects

Perception ◽  
1997 ◽  
Vol 26 (1_suppl) ◽  
pp. 11-11 ◽  
Author(s):  
S Trauzettel-Klosinski
Keyword(s):  
Eye Movements ◽  
Visual Field ◽  
Reading Ability ◽  
Reading Speed ◽  
Visual Fields ◽  
Zero Point ◽  
Normal Subjects ◽  
Visual Field Defects ◽  
Video Tape ◽  
Field Defects

The influence of different visual field defects on the reading performance was examined with potential adaptive strategies to improve the reading process in mind. By means of an SLO, the retinal fixation locus (RFL) was determined with the use of single targets and text, and eye movements scanning the text were recorded on video tape. Additionally, eye movements were monitored by an Infrared Limbus Tracker. Visual fields were assessed by the Tübingen Manual and/or automatic perimetry. Normal subjects, and patients with central scotomata, ring scotomata, and hemianopic field defects (HFD) were examined. The main pathological reading parameters were an increase of saccade frequency and regressions per line, and a decrease of reading speed. In patients with field defects involving the visual field centre, fixation behaviour is significant for regaining reading ability. In absolute central scotoma, the lost foveal function promotes eccentric fixation. The remaining problem is insufficient resolution of the RFL, which can be compensated for by magnification of the text. In patients with insufficient size of their reading visual field, due to HFD and ring scotoma, it is crucial that they learn to use a new RFL despite intact foveolar function. Preconditions for reading have been found to be: (1) sufficient resolution of the RFL, (2) a reading visual field of a minimum extent, and (3) intact basic oculomotor function. In patients with visual field defects involving the centre, a sensory-motor adaptation process is required: the use of a new RFL as the new centre of the visual field and as the new zero point for eye-movement coordinates.

scholarly journals VISUAL FIELD DEFECTS;

2017 ◽  
Vol 24 (10) ◽  
pp. 1527-1533
Author(s):  
Muhammad Khalid ◽  
Mehwish Aslam ◽  
Umer Farooq Raina ◽  
Khaleeq UZ Zaman
Keyword(s):  
Visual Field ◽  
Adult Population ◽  
Case Series ◽  
Female Gender ◽  
Visual Field Defects ◽  
International Studies ◽  
Case Series Study ◽  
Computerized Perimetry ◽  
Series Study ◽  
Field Defects

Objectives: To obtain and compare the exact visual status before and afterexcision of sella supra sellar tumors using the computerized perimetry as a standard measuringtools and then compare with the international studies. Background: Sella suprasellar tumorsare though not so common but affect visual acuity of patients and their quality of life drops.These tumors include pituitary adenoma commonest in the adult population, meningioma,Craniopharyngioma, astrocytic glioma, Optic nerve Glioma, Germinoma, Dermoid, Pituitarymetastases. We planned a descriptive case series study to compare the pre and post excisionvisual field defects using computerized perimetry. Study Design: Case series study. Setting:Department of Neurosurgery, Pakistan Institute of Medical Sciences, SZABMU, and Islamabad.Period: 2 years from January 2015 to December 2016. Methods: A total of 73 patients withsella suprasellar tumors were identified and enrolled. Patients between the age of 10 and55 years were selected on the basis of having sella supra sellar tumor on CT/MRI brain withcontrast. Patients whose age was less than 10 years and more than 55 years were excluded.Moreover, patients with post radiation necrosis diagnosed on MRI and MR spectroscopy brain,those operated for other eye pathology and patients with sella supra sellar SOL having comorbiditieslike diabetes mellitus, hypertension etc. were also excluded from the study. Thestudy outcome was measured in terms of comparison of visual field defects after excision ofsella suprasellar tumors using computerized perimetry. Results: The average age of patientswas 42.1 + 6.8 years ranging from 10 to 55 years. Female gender was predominant; therewere 40 (54.8%) female patients. The mean computerized perimetry was 0.65 + 0.34 LogMARbefore surgery which improved to 0.19 + 0.12 LogMAR after surgery. Overall, of the 73 cases,63 (86.4%) had improvement whereas 10 (13.6%) study cases had no improvement in thevisual field on follow-up. Conclusion: It can be concluded that after craniotomy and excisionof sella suprasellar tumors, perimetry showed improvement in the majority of the study cases.

Retrogeniculate Visual Field Defects

Visual Fields ◽  
2010 ◽  
Author(s):  
Thomas R. Hedges III
Keyword(s):  
Visual Field ◽  
Vision Loss ◽  
Visual Fields ◽  
Field Testing ◽  
Visual Field Defects ◽  
Automated Perimetry ◽  
Loss Of Vision ◽  
Data Points ◽  
Field Defects ◽  
Macular Sparing

Automated perimetry has changed visual field testing considerably in recent years. What was considered an art has become an exercise in interpreting a set of data points obtained mechanically. Automated perimetry saves ophthalmologists time, which ideally should allow for more visual fields to be obtained on patients with unexplained vision loss. However, one must still keep in mind that automated perimetry still depends on the subjective responses from the patient. More important, automated perimetry has made interpretation of visual field defects, especially those due to occipital lesions, more difficult. For example, macular sparing may not be reflected, especially with programs limited to the central 24° or 30°. A 10° field may be required to show macular sparing. Also, sparing or involvement of the temporal crescent will not be shown with 24° or 30° visual fields. The limitation of most programs may lead to the appearance of incongruity when in fact the field is indeed congruous. Sometimes, a small homonymous hemianopic scotoma will be detected when one eye is tested but will be completely missed when the other eye is tested, giving the false impression that the visual loss is monocular. This is especially problematic if the patient also falsely interprets his or her homonymous loss of vision as monocular. Such individuals may complain of loss of vision in one eye when in fact it is one half of their visual field that is defective. The strategy of automated testing on either side the vertical and horizontal meridians may lead to the false impression that field defects respect the vertical or horizontal meridian when they do not. Automated perimetry should make it possible to test more patients with unexplained vision loss, but all automated visual fields must be interpreted with caution and, when necessary, substantiated with some other method, such as the tangent screen, which remains the most powerful method of detecting the size, shape, and density of visual field defects. Because most ophthalmologists no longer use tangent screen testing, at least an Amlser grid should be used to qualify the nature of a paracentral visual field defect.

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