PubMed Health⌕ Search

SEARCH · PubMed Health

Results for “Computer vision”

Explore indexed PubMed citations for clinical trials, systematic reviews and public health research. Read source abstracts and follow each citation to its original PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 1,387 records · Page 77Linked to original sources
PubMed1982

Orbital tumours.

Explore the source record for details and available documents.

Adult↗
PubMed1995

Recognition performance of subjects with color-vision deficiencies on a polychromatic sonar screen for ship navigation.

To facilitate differentiation between objects that are approaching, stationary, and moving away, these objects are represented in different colors on the screens of sonar locating devices used in ship navigation. Yellow represents stationary objects, and represents approaching objects, and green represents those objects moving away. A total of 46 subjects with normal color vision and 184 individuals with color-vision deficiencies, among them 29 deuteranopic, 100 deuteranomalous, 21 protanopic and 34 protanomalous individuals, were investigated for their ability to identify different signals. Ten different objects were presented for a period of 64 s each. As a minimal requirement it was established that 50% of the respective experimental group be capable of recognizing the objects within half of this time. Whereas 73.3% of the subjects with normal color vision could meet this requirement, none of the subjects in the different groups with color-vision deficiencies could do so. Only 16.1% of the deuteranopic subjects, 33.1% of the deuteranomalous individuals, 16.2% of the protanopic subjects, and 37.6% of the protanomalous individuals detected all objects within 32 s. No appreciable difference in the ability to recognize signals occurred among the different groups of subjects with color-vision deficiencies.

Color Perception↗
PubMed1993

[Pattern-induced flicker colors. An ophthalmologic examination method].

The pattern-induced flicker colours (PIFC), which belong to the subjective colours, are presented here as a method of investigating diseases of the eye and the visual track. Starting with Benham's top, new methods are elaborated for producing PIFC by means of rotating black and white discs and a computer-controlled black and white monitor. The investigations were performed in 40 normal and 111 pathological cases. A differentiation is made concerning the neuronal X-Y system. Different deficiencies result from different diseases. The PIFC are particularly suitable for the differential diagnosis of the neuritis nervi optici.

Adult↗
PubMed1996

[Reproducibility of contrast sensitivity test results].

Two methods (a double staircase and an adjustment method) for repeated measuring of the contrast sensitivity in inexperienced observers (e.g. in patients undergoing the photorefractive keratectomy) were compared in 10 subjects. Using the coefficient of repeatability of Bland and Altmann it could be shown that the reproducibility is better in the method of adjustment. The coefficient of repeatability of this method amounted for 95% confidence limits to 4.78 dB, whereas in the method of double staircase it was 8.70 dB.

Adult↗
PubMed1996

Acute dacryocystitis: an unusual cause of life-threatening orbital intraconal abscess with frozen globe.

An 84-year-old woman developed a markedly proptotic right eye with external ophthalmoplegia and displacement of the globe into the superotemporal orbit. She had minimal pain and no history of the usual predisposing causes of orbital cellulitis. Vision was unaffected. Orbital computed tomography (CT) showed an extraconal inferomedial abscess with an adjacent intraconal component. A purulent abscess in the anterior inferomedial aspect of the orbit, which extended into the medial aspect of the intraconal space, was incised and drained. After surgery, the orbital inflammation and proptosis resolved, but an irreducible, nonpurulent lacrimal sac mucocele persisted. A dacryocystectomy was performed. Pathologic examination of the lacrimal sac biopsy specimen showed only chronic nongranulomatous inflammation. This case demonstrates that acute dacryocystitis may cause an intraconal orbital abscess with proptosis and complete external ophthalmoplegia, and represent a sight- and life-threatening condition.

Abscess↗
PubMed1996

[Variability of findings in light sense and ring perimetry].

The variability of the interpretation of visual fields by physicians has so far been thoroughly examined only with reference to light sense perimetry. Therefore, we studied the variability in assigning visual fields to topical diagnoses of the visual pathway with the ring perimeter. For this purpose we examined the proportion of correct assignments of physicians and the reproducibility of their assignments. Two experienced ophthalmologists had to assign 76 selected pairs of right and left visual fields to one of the following diagnosis without any information about further clinical findings: (1) normal (n = 5), (2) media opacity (n = 5), (3) retinal lesion (n = 5), (4) optic disc lesion (n = 6), (5) optic nerve lesion (n = 6), (6) lesion of the chiasma (n = 5) and (7) retrochiasmal lesion (n = 6). The assignment was repeated after intervals of 6 weeks and 10 months. Our statistical analysis of the number of correct assignments revealed no significant differences between the perimeters or between the physicians. The amount of correct assignments with both perimeters decreased from 75% and 66% during the first run through 60% and 70% during the second run to 58% and 60% during the third. Neither perimeter showed any major differences in the reproducibility of the assignments (Fig. 4). During the three runs only 47% (physician 1) and 58% (physician 2) of the cases were assigned three times to the same diagnoses with the octopus. The corresponding figures for the ring perimeter were 58% and 60%. This is regarded as an indicator of the unreliability in the interpretation of visual fields.

Adult↗