The photo appears most consistent with a subconjunctival hemorrhage: a small surface blood vessel has broken, causing a sharply localized pool of blood over the white of the eye. It is usually painless and does not affect vision.

Because this has happened three times in a few months and he has hypertension, he should arrange a non-emergency appointment with an ophthalmologist or primary-care clinician within days for:

Hypertension, diabetes, straining from coughing/constipation/heavy lifting, eye rubbing or minor trauma, and blood-thinning medicines can contribute. The Wills Eye Manual recommends checking blood pressure and considering bleeding risks and conjunctival causes in recurrent episodes. The Wills Eye Manual, pp. 335-336. A hospital eye-care guide similarly notes that these bleeds commonly settle by themselves within 1-2 weeks, while hypertension and diabetes increase susceptibility CUH guidance.

Go to urgent eye care or emergency services today if there is any:

Do not stop prescribed blood-pressure or blood-thinning medication without the prescriber’s advice. Avoid rubbing the eye; lubricating drops can be used only for comfort. If this is painless and vision is normal, the blood itself generally fades over 1-2 weeks, often changing from red to yellow as it resolves.

Normal blood-pressure readings are reassuring. With a painless red patch and normal vision, this still most likely represents a subconjunctival hemorrhage, which is blood under the clear surface covering of the eye. It usually clears without treatment in about 1-2 weeks.

However, since this is the third episode in a few months, it should not be ignored even if BP is normal. Arrange a routine appointment with an ophthalmologist/eye specialist or physician for:

Recurrent episodes warrant assessment for uncommon clotting or local eye-surface causes even when blood pressure is normal. The Wills Eye Manual, pp. 335-336. The AAO reference also notes that recurrent cases may need systematic medical evaluation.

No antibiotic or steroid eye drops are needed for a simple bleed. Do not stop any prescribed medicine on your own. Avoid rubbing the eye. Artificial tears are fine if there is mild irritation.

Seek urgent eye care today if pain, light sensitivity, discharge, blurred/reduced vision, severe headache, nausea/vomiting, eye injury, or redness spreading around the colored part of the eye develops.

Do not use Itone eye drops to treat a subconjunctival hemorrhage. It will not dissolve or speed absorption of the blood.

A simple subconjunctival hemorrhage needs no medicated drops and normally clears on its own over 1-2 weeks. Itone is a multi-herbal eye-drop product marketed for eye comfort, not an evidence-based treatment for bleeding under the conjunctiva. It may cause burning, irritation, or allergy in some people.

If the eye feels dry or mildly gritty, use only preservative-free artificial tears/lubricant drops for comfort. Do not use redness-relieving drops, antibiotic drops, or steroid drops unless prescribed after an eye examination.

Because he has had recurrent episodes, still arrange a routine eye/medical review. Urgent review is needed if pain, photophobia, discharge, blurred vision, injury, or worsening redness occurs.