5 votes
Accepted

How to reduce the side effects of wearing contact lens?

Questions 1-2 Unfortunately, the answer to these depend on the exact brand and line of contacts used. For example, here is a long list of silicon hydrogel lenses, and how long they last. Here is ...
argentum2f's user avatar
4 votes
Accepted

What is the function of the collagen fibres in the vitreous body of the human eye?

Collagens are a family of fibrous proteins (as opposed to globular proteins like enzymes and hormones and membrane proteins like cell receptors) that form part of connective tissue. Thus they are ...
Chris's user avatar
  • 3,304
4 votes
Accepted

why is it not allowed to take aspirin based medicines before a day and after a week of cataract surgery?

Aspirin has a "blood thinning" effect; it inhibits platelet aggregation. Therefore, it gives a higher risk of bleeding in the period surrounding the surgery. I have not found a review about ...
Tami's user avatar
  • 466
3 votes
Accepted

Safe and state-of-the art method of laser vision/eyesight correction/surgery?

Brief description: LASEK and LASIK - cut a flap in the eye, use a laser to remove material underneath to reshape the lens and correct vision. LASIK has been around for a while, so there have been a ...
argentum2f's user avatar
3 votes

Is the blue light emitted by computer monitors deleterious for the human eyes?

Is the blue light emitted by computer monitors deleterious for the human eyes? No. UV from the Sun (or other strong UV sources, such as germicidal bulbs) is harmful. Blue light from a computer ...
Rob's user avatar
  • 221
3 votes

What effects would aspheric contact lenses have on eyes without astigmatism?

A toric lens is the type that is used to treat astigmatism, not an aspheric lens. An aspheric lens is primarily designed to correct for the spherical aberration of the contact lens itself, the ...
Fonebone's user avatar
  • 237
3 votes
Accepted

macular insult during optic neuritis

Optic neuropathy vs optic neuritis Stat Pearls (Guier and Stokkermans 2021. NBK557853) notes that: A wide range of conditions including infections, trauma, vascular insufficiency, metastases, toxins, ...
Ian Campbell's user avatar
  • 3,243
2 votes

Why do optometrists recommend dilation when the power of a lens can be measured even by a ruler?

The value of dilation of the pupil far outweighs the inconvenience.In fact, I'd offer that if an exam is done without it, you potentially lose the following: --full access to all the structure of the ...
Robert Carnes's user avatar
2 votes

Is the common saying that sitting close to a screen regularly can cause short-sightednes backed by medical science?

There is certainly an association between reading at short distances and myopia. Here's an article that suggests a possible mechanism: Reading and Myopia: Contrast Polarity Matters Basically, they ...
Armand's user avatar
  • 992
2 votes

Why do the eyes need to be closed during sleep to regain moisture?

Tears are very complex fluids. Their job is to lubricate, moisturize, and oxygenate the corneas and inner eyelids, to be antibiotic/antiviral, to break down byproducts, etc. They're continually ...
wisdom_seeker's user avatar
2 votes

Rationale for Pilocarpine instillation after retrobulbar haemorrhage

Retrobulbar hemorrhage (RH) is (Johnson et al., 2009). an ocular emergency resulting from arterial bleeding in the orbital cavity behind the eye. Because the orbit is a relatively fixed space, ...
Chris Rogers's user avatar
  • 6,166
2 votes

What is the angular resolution of the 'ideal' human eye?

In general, resolution varies with distance, but when expressed as angular resolution this takes distance into account; the minimum distance between two points that can be resolved will increase in ...
Chris's user avatar
  • 3,304
2 votes

Which nerve inflammation can affect vision other than the optical nerve itself?

The vision can be sharp when the light is focused exactly on the retina, not in front or behind it. This is enabled by the constant eye bulb length and the ability of the lens to accommodate to near ...
Jan's user avatar
  • 15.9k
2 votes
Accepted

Is there a convenient self test for Glaucoma?

Disclaimer: I have no formal medical or vision science training. Please point out any factual errors. My test is based on the idea that Glaucoma is indicated by pressure on optic nerve, which one may ...
Ruminator's user avatar
  • 601
1 vote
Accepted

How can the human eye be tricked into keeping the lense relaxed?

To form a clear image, light must be focused on the retina, which detects the light and sends signals through the optic nerve to the visual centre of the brain. To achieve the focusing, most ...
Chris's user avatar
  • 3,304

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