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Related Concept Videos

Accessory Structures of the Eye01:17

Accessory Structures of the Eye

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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...
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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...
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The sequence of removing or doffing PPE starts with the gloves, as they are the most contaminated. Next is removal of the face shield or goggles, as they would interfere with removing other PPE. Then remove the gown, followed by the mask or respirator. Perform hand hygiene between steps if hands become contaminated and immediately after removing all PPE. Generally, the outside front and sleeves of the isolation gown, the goggles or the mask, the respirator, and the face shield are contaminated.
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Donning PPE must be completed before contact with the patient. This process protects from infectious agents. The sequence and action included in each donning are critical, and the steps must be systematic to avoid exposure to pathogens. The institutional policy also needs to be followed while donning PPE. The pre-donning preparations are gathering equipment, inspecting the PPE equipment for tears, holes, or damage, removing jewelry, removing any garments below the elbows, and tying the hair...
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Related Experiment Video

Updated: Oct 18, 2025

Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter
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Using face masks with spectacles versus contact lenses.

Carole Maldonado-Codina1, Maria Navascues-Cornago1, Andrew J Plowright1

  • 1Eurolens Research, Division of Pharmacy and Optometry, Faculty of Biology, Medicine and Health, The University of Manchester, Oxford Rd, Manchester M13 9PL, UK.

Contact Lens & Anterior Eye : the Journal of the British Contact Lens Association
|October 5, 2021
PubMed
Summary

Contact lenses (CL) offer superior comfort and vision quality compared to spectacles (Sp) when wearing face masks. This study found CL users reported fewer mask-related issues like fogging and improved daily activity performance.

Keywords:
Face maskFoggingSoft contact lensSpectaclesVision

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Development of an In Vitro Ocular Platform to Test Contact Lenses
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Area of Science:

  • Ophthalmology
  • Vision Science
  • Contact Lens Technology

Background:

  • Face masks can cause ocular discomfort and visual disturbances.
  • Spectacle wearers often experience issues like lens fogging and heat discomfort.
  • Neophyte contact lens wearers may offer a unique perspective on mask-related visual parameters.

Purpose of the Study:

  • To compare subjective ocular and task-related parameters between neophyte contact lens (CL) wear and habitual spectacle (Sp) wear while using face masks.
  • To evaluate the impact of face mask use on quality of life and visual symptoms in CL versus Sp wearers.

Main Methods:

  • Thirty participants were randomized into spectacle (n=15) or daily disposable CL (n=15) groups.
  • Participants wore a surgical face mask for at least one hour/day, four days/week for two weeks.
  • Validated questionnaires (QIRC, face mask usability) and visual analogue scales (VAS) for ocular symptoms were administered.

Main Results:

  • No difference in overall quality of life (QIRC), but CL wearers reported better 'outdoor activities', 'keep fit', and 'able to do things'.
  • CL wearers reported significantly better mask usability regarding 'breathing', 'heat', 'comfort on ears', and 'overall comfort'.
  • CL wearers experienced fewer vision-related symptoms, including glare, fogging, and restricted field of view, compared to spectacle wearers.

Conclusions:

  • Contact lenses provide a superior visual and comfort experience compared to spectacles when wearing face masks.
  • CL wear in conjunction with face masks improves vision-related symptoms and comfort, potentially enhancing mask adherence.
  • Contact lenses are recommended as the preferred vision correction option for individuals using face masks.