Psychophysical scaling of the prism diopter unit

The present experiment was a preliminary attempt to use the psychophysical scaling methods of magnitude estimation and cross-modal matching to investigate suprathreshold judgments of lingual vibrotactile and auditory sensation magnitudes for 20 normal young adult subjects. A 250-Hz lingual vibrotactile stimulus and a 1000-Hz binaural auditory stimulus were employed. To obtain judgments for nonoral vibrotactile sensory magnitudes, the thenar eminence of the hand was also employed as a test site for 5 additional subjects. Eight stimulus intensities were presented during all experimental tasks. The results showed that the slopes of the log-log vibrotactile magnitude estimation functions decreased at higher stimulus intensity levels for both test sites. Auditory magnitude estimation functions were relatively constant throughout the stimulus range. Cross-modal matching functions for the two stimuli generally agreed with functions predicted from the magnitude estimation data, except when subjects adjusted vibration on the tongue to match auditory stimulus intensities. The results suggested that the methods of magnitude estimation and cross-modal matching may be useful for studying sensory processing in the speech production system. However, systematic investigation of response biases associated with vibrotactile-auditory psychophysical scaling tasks appears to be a prerequisite.

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A Note on a "Dispersion Method" in Psychophysical Scaling

PsycEXTRA Dataset ◽

10.1037/e547022009-001 ◽

1971 ◽

Author(s):

Gunnar Borg

Keyword(s):

Dispersion Method ◽

Psychophysical Scaling

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The 20 Prism Diopter Base Out Prism Test in Pseudostrabismus

Journal of Binocular Vision and Ocular Motility ◽

10.1080/2576117x.2021.1906830 ◽

2021 ◽

pp. 1-5

Author(s):

Jocelyn Zurevinsky ◽

Anthony Ojukwu

Keyword(s):

Prism Diopter

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Surgery option in the management of delayed diplopia after radiation therapy for nasopharyngeal carcinoma

European Journal of Ophthalmology ◽

10.1177/1120672118757430 ◽

2018 ◽

Vol 28 (5) ◽

pp. 547-551

Author(s):

Leilei Zou ◽

Sujia Wu ◽

Yan Liu ◽

Shu Wang ◽

Wen Wen ◽

...

Keyword(s):

Radiation Therapy ◽

Nasopharyngeal Carcinoma ◽

Case Series ◽

Topical Anesthesia ◽

Lateral Rectus ◽

Prism Diopter ◽

Retrospective Case ◽

Patient Reported ◽

Sixth Nerve

Purpose: Radiation therapy is a standard treatment for nasopharyngeal carcinoma. Diplopia due to radiation damage to the sixth nerve significantly erodes the patient’s quality of life. This study investigated the effectiveness of extraocular surgery in the treatment of delayed diplopia caused by radiation therapy. Methods: A retrospective case series of 16 patients (7 men and 9 women) with delayed diplopia after radiation therapy for nasopharyngeal carcinoma was enrolled in the study. Unilateral lateral rectus resection was performed under topical anesthesia. Follow-up time was more than 12 months. Outcome measures were prism diopter and self-reported symptoms. Results: All patients diagnosed with sixth nerve palsy reported elimination of symptoms on postoperative day 1 without complications. One patient required a second procedure due to recurrence of symptoms. At 12-month follow-up, no patient reported recurrence of symptoms. The absolute horizontal deviation significantly decreased from a preoperative value of 16 prism diopter to a value of 1.5 prism diopter postoperatively (p < 0.001). Conclusion: These results suggest that unilateral lateral rectus resection under topical anesthesia is an effective treatment for delayed diplopia after radiation therapy for nasopharyngeal carcinoma. A large randomized prospective study to confirm these findings is warranted.

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Psychophysical Scaling of Circular Vection (CV) Produced by Optokinetic (OKN) Motion: Individual Differences and Effects of Practice

Journal of Vestibular Research ◽

10.3233/ves-1996-6502 ◽

1996 ◽

Vol 6 (5) ◽

pp. 331-341 ◽

Cited By ~ 6

Author(s):

Robert S. Kennedy ◽

Lawrence J. Hettinger ◽

Deborah L. Harm ◽

J. Mark Ordy ◽

William P. Dunlap

Keyword(s):

Individual Differences ◽

Circular Vection ◽

Psychophysical Scaling

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Surgical outcomes of acute acquired comitant esotropia of adulthood

BMC Ophthalmology ◽

10.1186/s12886-020-01793-3 ◽

2021 ◽

Vol 21 (1) ◽

Author(s):

Dae Hyun Kim ◽

Ha Jeong Noh

Keyword(s):

Success Rate ◽

Surgical Outcomes ◽

Medical Records ◽

Large Angle ◽

Sudden Onset ◽

Prism Diopter ◽

Factors Affecting ◽

The Mean ◽

Motor Outcomes

Abstract Background Acute acquired comitant esotropia (AACE) is a type of strabismus characterized by a sudden onset of large angle esotropia with diplopia, which often occurs in children after infancy, teenagers, and young adolescents. However, studies on the surgical outcomes of only adults are rare. The purpose of this article is to analyze the surgical outcomes for adult patients diagnosed with AACE. Methods Medical records of 24 patients who had undergone surgery for AACE were retrospectively analyzed. The main outcome measures were the final motor and sensory success rate after surgery and factors affecting motor and sensory outcomes. Motor success was considered alignment within 8 prism diopter (PD) at both near and distance and sensory success was stereoacuity ≥ 60 sec/arc. Results The preoperative mean esodeviation angles were 33.1 ± 10.4 PD at distance and 33.3 ± 11.2 PD at near. The mean period of postoperative follow up was 7.5 ± 4.5 months (range 1–8 months). The postoperative mean esodeviation angles at final follow-up time were 3.4 ± 6.1 PD at distance and 3.8 ± 6.7 PD at near. The surgical motor success rate at final follow-up was 79.2% (19/24). The sensory success rate at final follow-up was 50.0% (12/24). The factor affecting the motor outcome was the type of surgery (p < 0.05). The factor affecting sensory outcome was postoperative follow-up time (p < 0.05). Conclusions Surgery type appears to affect surgical motor outcomes in adults with AACE. Although the sensory outcome was favorable, it seems that regaining bifoveal fixation takes time.

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