Positives

• A long-COVID patient reports that a Manta sleep mask dramatically improved their deep sleep, with noticeably more restful nights Reddit.
  
  

Negatives

• An ophthalmologist commentary on sleep mask safety notes that weighted masks delivering 100-200g of deep-touch pressure raise concerns about elevated intraocular pressure, particularly relevant for patients with glaucoma or recent eye procedures. Nidragoods.
• Reviewed.com's evaluation of weighted eye masks noted testers experiencing temporary post-wear blurriness for 10-15 minutes each morning with flat-design masks, suggesting the pressure on the eyeball is non-trivial during a full night of wear. Reviewed.

Hurdles & Side Effects

• Manta Sleep's weighted-mask guidance notes that some users experience claustrophobia or difficulty falling asleep when first wearing a weighted mask, and recommends a multi-night adjustment period before judging tolerance. Mantasleep.