Related Experiment Video
Updated: Jul 26, 2025

04:00
Author Spotlight: Establishing a Practical and Cost-Effective Protocol for Corneal Sensitivity Testing in Clinical Settings
Published on: August 2, 2024
2.0K
Implication of photic sneeze reflex in ophthalmology
Pooja A Shetty1, Shruti Bhat2, Vikram Jain3
1Cataract and Anterior Segment, Prasad Netralaya, Mangalore, Karnataka, India.
Indian Journal of Ophthalmology
|June 16, 2023
Summary
Photic sneeze reflex (PSR) causes uncontrollable sneezing when exposed to bright light. This video discusses PSR
Area of Science:
- Ophthalmology
- Genetics
- Neurology
Background:
- Photic sneeze reflex (PSR), also known as autosomal dominant compelling helioophthalmic outburst, is a rare genetic condition.
- Characterized by uncontrollable sneezing triggered by bright light exposure.
- The precise physiological mechanism remains poorly understood, with several hypotheses proposed.
Observation:
- Ophthalmic examinations, including slit lamp, indirect ophthalmoscopy, and surgical microscopy, can provoke sneezing in PSR patients.
- A case of a 74-year-old male with vision loss in the left eye is presented.
- The patient exhibited repeated sneezing during routine ophthalmic examinations.
Findings:
- The patient was diagnosed with photic sneeze reflex (PSR).
- He had pseudophakic bullous keratopathy in the right eye and senile cataract in the left eye.
- Cataract surgery was successfully performed uneventfully, with specific considerations for his one-eyed status and PSR.
Implications:
- Highlights the challenges posed by PSR in ophthalmic practice.
- Underscores the importance of recognizing and managing PSR in patients undergoing eye surgery.
- Provides insights into managing ophthalmic conditions in patients with photic sneeze reflex.
Related Concept Videos
Accessory Structures of the Eye
1.7K
Optical perception, or vision, is an extraordinary sense dependent on converting light signals received via the ocular organs. These organs, known as eyes, are securely positioned within the bony cavities of the skull, called orbits. The orbits serve a dual purpose: a protective shield for the ocular globes and a stable attachment point for the soft ocular tissues. The eye's external protective mechanisms include the eyelids, which are edged with lashes that act as a barrier against foreign...
1.7K
Photoreceptors and Visual Pathways
6.1K
At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
6.1K
Anatomy of the Eyeball
7.2K
The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle...
7.2K
Glaucoma: Overview
633
Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...
633
Angle Closure Glaucoma: Treatment
578
Angle-closure glaucoma, or closed-angle glaucoma, is an eye condition where the iris bulges out and blocks the iridocorneal angle, resulting in a buildup of aqueous humor and increased intraocular pressure. Immediate medical attention is necessary due to the sudden onset of symptoms. The treatment for angle-closure glaucoma includes short-term and long-term approaches. Short-term treatment involves using eye drops like pilocarpine to lower intraocular pressure by increasing aqueous humor...
578
Focusing of Light in the Eye
3.0K
Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
3.0K

