Anterior Segment, Corneal and External Disorders
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Update on Presbyopia-correcting Drops

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Published Online: Dec 21st 2017 European Ophthalmic Review, 2017;11(2):99–102 DOI:
Authors: Feyza Çalis Karanfil, Burak Turgut
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Presbyopia causes diminishing of vision-targeted life quality and occupational performance for most people over 40 years old. It affects the ability to perform visual tasks at near distance such as book reading, handcrafts, stitching, cooking and surgical operation. Although there are some treatment modalities such as surgery, the use of near-glasses and contact lenses for presbyopia, topical drug treatment for pharmacological control of presbyopia is currently a very popular and attractive nonsurgical option. In this review, we tried to summarise the presbyopia drop treatment.


Presbyopia, para-sympathomimetic, accommodation, ciliary muscle contraction, drop treatment, myosis, lens softening, increased focus depth


Presbyopia is progressive age-related reduction in accommodation amplitude and the loss of ability of the eye to focus on near objects. It occurs in almost everyone at around 40 years of age.1–5 Presbyopia affects visual tasks at near distance such as book reading, handcrafts, stitching, cooking and surgical operation. Thus, it causes the diminishing of vision-targeted life quality and occupational performance of many people over 40.1–5

The physiopathology of presbyopia is not clearly known. However, it has been demonstrated that various factors including the hardening of the lens, changes in the elasticity of the lens capsule, lens dimension, geometry of zonular attachments and ciliary muscle contraction may be responsible for the accommodative loss in presbyopia.1,2

Accommodation in humans is performed by ciliary muscle (CM) and iris sphincter contractions, convergence and changes in the shape and position of the lens. The muscles of the iris and ciliary body are stimulated by the parasympathetic system. The parasympathetic cholinergic stimulation causes the contraction of the CM and myosis, providing the increase of focus depth and the shape and position of the lens both to change and for accommodation to develop.3

In an eye which is un-accommodated and looks at a distant object, CM is relaxed; the anterior zonular fibers (ZF) are stretched by traction from the posterior ZF. Then, anterior ZF flattens the lens. In the accommodated eye, the forward and inward movement of the ciliary muscle allows the tension fiber system to take up the tractional forces from the posterior ZF and releases the tension in the anterior ZF; both the thickness and refractive power of the lens increase.3–5

There are some surgical modalities including refractive lens exchange, mono-vision laser-assisted in situ keratomileusis (LASIK), blended vision LASIK, multifocal or accommodating intraocular lens (IOL) implantations and corneal inlay implantation for the treatment of presbyopia.4–7 Nonsurgical treatments for presbyopia include the use of near-glasses and contact lenses.5 Nowadays, otorities are speculating about topical parasympathomimetic drop treatment for pharmacological control of presbyopia, which is a nonsurgical option for the vast majority of people with near vision spectacle dependence over 40 years old.8

Presbyopia treatment modalities are based on reducing pupil sizes because smaller pupil sizes increase near visual acuity by increasing focus depth. Also, central light waves reach the retina, which results in clearer vision. A drop for presbyopia treatment must create a similar and long-lasting effect on pupil apertures to be successful.7 The commercial and noncommercial drops used or tried in the treatment of presbyopia are given in Table 1. Reducing pupil size is not without adverse effects. A constricted pupil decreases vision at night – less light enters the eye, and diffraction at very small pupil sizes can decrease overall vision quality and also lead to myopic shift compromising distance vision. To reduce this side effect drops can be used monocularly. Even monocular pharmacological treatment with a single miotic agent has been shown to result in acceptable reading vision for many presbyopes, even older recipients. But a mono-vision treatment could degrade visual performance in reduced light conditions compared to a binocular approach. In monocular treatment, the vision in the fellow eye with the normal pupil will have some blurry near vision, but distant objects are clear and there is no diminished light perception. When the images are merged, patients may have clear focus at near and distance with no perception of dimness. The reduction of the amount of light falling on the retina may cause the worsening of the vision, especially in elderly patients.5,8 However, the increasing of the illumination may decrease these complaints.

Muscarinic agonistic agents cause miosis, increase the depth of focus and create pseudo-accommodation. However, parasympathomimetic drops with muscarinic stimulation of anterior uveal tract such as carbachol, pilocarpine and physostigmine, an anti-cholinesterase inhibitor, cause chronic inflammation and stimulation of fixed pupil, posterior synechiae and spasmodic contractions of the iris and CM, pigment dispersion, eventually a fixed pupil and myopic shift. Thus, some additional drops including non-steroidal anti-inflammatory drugs (NSAIDs) or steroids should be combined with pilocarpine for the elimination of local inflammation.8,9 The use of a combination of pilocarpine 1% and diclofenac 0.1% four times restores near vision without causing blurred far- and half-distance vision or inflammatory reactions.8,9 It has been reported that a combination of dexamethasone and pilocarpine prevents an inflammatory reaction, restores near vision but not far- and half-distance vision.8 The NSAIDs block cyclooxygenase, and decrease the hyper-parasympathomimetic effects of anticholinesterase inhibitors; they inhibit the inflammation in the anterior uveal tract, decrease spasmodic ciliary contraction, pigment dispersion and posterior synechia formation secondary to parasympathomimetic drugs and also they prolong the parasympathomimetic agent’s effect by prostaglandin synthesis inhibition in the anterior uvea.8–10

Muscarinic agonist with sympathetic agonist is another option for presbyopia treatment. Carbachol is a parasympathomimetic agent and, unlike pilocarpine, is a full agonist that also supports acetylcholine release from parasympathetic nerve endings. Additionally, it may also inhibit cholinesterase enzymes by its carbamate structure.10 In terms of inducing miosis, the most commonly used strength of carbachol is 2.25% (which is equivalent in effect to about 3% pilocarpine).11 Brimonidine is a α2-receptor agonist, used in glaucoma, exhibits pupillary action, and can make significant miosis, typically in low light conditions.12

A study evaluating the efficacy of a combination of carbachol 2.25% and brimonidine 0.2% eye drops monocular once daily for 3 months demonstrated that the combination provided a significant improvement in near visual acuity without any change in distance vision through improving the depth of focus and making the miosis.13 The same study group has recently published the results of another clinical trial, which compares the 3% carbachol with brimonidine 0.2% in only 10 patients – and they showed statistically significant results again.15 Given that they recruited almost five times as many patients for the 2.25% formulation, one can infer the formulation they likely favour.13

In a recent study, it was reported that another combination designed by Dr Vejarano including pilocarpine 0.247%, phenylephrine 0.78%, polyethylene glycol 0.09%, nepafenac 0.023%, pheniramine 0.034% and naphazoline 0.003% maintained the stimulation of the contraction of the CM and the physiological pupil diameter variation. Vejerano has suggested that this drop prevented the worsening of visual performance in the dark and provided physiological images merging with clear focus at all distances.15 Pilocarpine shows its positive effect on accommodation by providing both miosis and ciliary body contraction.8,9,15 Phenylephrine, nepafenac and pheniramine prevent excess miosis and counteract ciliary muscle spasm, vascular congestion and hyperemia induced by pilocarpine.15 Naphazoline empowers the relaxing effect of pilocarpine on dilator pupillary muscle and relieves its side effects by increasing acetylcholine release and reducing norepinephrine release.15

The lubricating effect of polyethylene glycol makes the drops more tolerable by preventing the burning effect of the compounds and improves the tolerance for using these drops.16 The synergistic effect observed by Vejerano between these compounds permits improved near vision and preserves distance vision in all subjects. The results showed a mean uncorrected near visual acuity (UNVA) improvement by about 2 to 3 lines in each eye. No patient had a loss of uncorrected distance visual acuity (UDVA) in each eye and binocularly. The synergism reduces symptoms of headache hyperemia and allows lower doses of the miotics to be used.17 In this study, Vejarano reported that the pupil diameter appeared significantly increased in photopic conditions only for the first hour and it appeared significantly decreased in scotopic condition between 4 and 5 hours after instillation of the drop. Pupil diameter was found to be mildly affected by the topical treatment, which is not fixed, allowing a ‘dynamic pseudoaccommodation’ and measurements showed that the treatment seemed to reduce significant pupil enlargement under scotopic conditions, as well as significant contraction in photopic conditions.15,17

PresbiDrops includes a combination of a parasympathomimetic agent with a NSAID in an oil-based formulation. However, the exact active ingredients of the drop are unknown. It has provided significant improvements in both near and distant visual acuities.18

Liquid vision, binocularly instilled, has a pure miotic effect without stimulation of accommodation. The rationale is to produce a pinhole effect, avoiding the ciliary muscle contraction that would cause a myopic shift, worsening far vision. The company claims a rapid effect on the pupil that leads a stable pupil diameter of approximately 1.6 mm, with a duration action of approximately 8 hours. In the preliminary trials performed by Dr Castillo, UNVA improved 3 to 7 lines on the Jaeger scale without compromising distance vision.19

Presbyeyedrops is another eye drop based on a combination of two parasympathomimetic agents (unknown exact active ingredients and a NSAID). It has been reported that drop treatment provided improvements in both UDVA and UNVA.9

Muscarinic agonist and alpha agonist or a COX-2 selective NSAID pharmacology of NSAIDs goes one step further. NSAIDs inhibit the cyclooxygenase (COX) enzyme family, which is responsible for prostaglandin and thromboxane synthesis. Humans have two functional COX isoforms, COX-1 and COX-2, COX-2 typically being expressed in the inflamed tissue. Abad’s patent identifies using COX-2-specific inhibitors in combination with a cholinergic or muscarinic agent in an attempt to target COX-2-specific pro-inflammatory mediator production but sparing the prostanoid production related to COX-1.20

Rodríguez and Carrera combined pilocarpine with bromfenac, a NSAID. Their aim was to increase the duration of action due to bromfenac to 24 hours, and this allowed for a once-daily topical application – unlike diclofenac, which has an ocular half-life of fewer than 2 hours. However, to date no published studies are available on this formulation.21

Another eye drop that stimulates the ciliary muscle to accommodate and constrict the pupil is based on the proprietary components of PresbyPlus: two parasympathomimetic agents and one parasympatholytic. These eye drops were instilled bilaterally twice a day in a clinical trial that showed that 90% of subjects could see J4 to J1 within 1 year without adverse reactions.22

PRX-100 is a combination of muscarinic agonist and an antagonist, a registered preparation developed by ‘Presbyopia Therapies’, which contains aceclidine and tropicamide. Tropicamide, a mydriatic is an anti-muscarinic agent; aceclidine is a muscarinic agonist which is less potent than pilocarpine and carbachol. This drop is an eye drop which causes miosis without the typical accommodative effect. This constriction increases the focus depth and it provides improvement in near vision without impairment in distance vision with the pinhole effect. The pinhole allows light to be focused more centrally on the retina, improving the clarity of vision across a range of distances. This smaller pupil size reduces the light that is received by the retina, improves the contrast sensitivity, and eliminates stray light.23 Tropicamide has the opposite effect of aceclidine. Tropicamide has a much higher affinity for iris M3 receptors (as opposed to ciliary M3 receptors) than other anti-muscarinic agents. This effect allows pupil dilation with minimal influence on accommodation. It may diminish the spasm of sphincter papillae with the minimal unwanted antagonism of ciliary contraction that is required for accommodation. PRX-100 drop shows its effect in 30 minutes following application and its effect continues about 5 hours. In a study, it has been reported that all of the participants with presbyopia experienced marked improvement in near vision with the unique side effect of short-term dimming in vision due to decreasing of the amount of light which entered into the eye with pupil constriction.23,24

Recently, it has been reported by Encore Vision/Novartis that EV06 ophthalmic solution including lipoic acid choline ester 1.5% improved binocular near acuity with no loss of the best-corrected distance vision. It is well known that the aging of crystalline lens diminishes the elasticity of the lens through the increasing protein sulfhydryl group oxidation to form protein cross-links, and the lens fibres harden and consequently, this causes accommodative amplitude loss and blurry near vision.25–29 EV06 is a prodrug penetrating the cornea which metabolizes to an organic compound to two natural substances: lipoic acid and choline. EVO6 is catabolised by cellular esterases, increases lens elasticity by decreasing the number of protein-disulfide bonds and makes the crystalline lens more elastic and softer via natural un-crosslinking.27–29

Liquid Vision drops provide a temporary presbyopia-correcting therapeutic effect designed to last five hours or longer. Its phase IIb trial is continued. Liquid Vision eye drop contains aceclidine (a miotic) and tropicamide (a cycloplegic) to provide a ‘super pinhole’ effect and moderate accommodation. Aceclidine is used for creating the pinhole effect but by itself, this creates strong accommodation, including ciliary spasm and distance vision blur. Tropicamide reduces accommodation. Mutual effect between these two drugs improves both near and distance vision simultaneously. This drop shows action within 30 minutes after using. It is using binocularly and is designed to make better near and distance vision. Presbyopia Therapies added tropicamide to a formulation for moderating accommodation and reducing the ciliary side effects. Patients who have lens opacities may complain about ocular scatter related to small aperture optics. This is the disadvantage of the brimonidine-carbachol drop. The big advantage is that if it does not work, patients can give up using the drop, as long as no long-term detrimental effects are discovered.23,24,30

FOV Tears, a binocular presbyopia-correcting drop is a combination of parasympathetic, alpha agonists 1 and 2, an anti-cholinesterase and a NSAID. The drop affects the ciliary muscle, which causes a physiological accommodation and a dynamic pseudo-accommodation. At the end of the third month of use, all participants did not need near eye-glasses for normal activities.31

In a recent study, a combination of carbachol 3% and brimonidine 0.2% drop for presbyopia correction provided statistically significant improvement in mean near visual acuity in all subjects who used combined carbachol 3% and brimonidine 0.2% in the same formulation compared with those who used separate forms. Additionally, the monocular treatment with one drop a day of a combination of carbachol and brimonidine in the non-dominant eye permitted acceptable reading vision for the majority of older subjects with presbyopia. This drop constricts the pupil and increases the depth of focus with the pinhole effect, similar to the corneal inlay.13

AGN-199201 (estimated to be an α-sympathomimetic agent oxymetazoline, and AGN-190584 (an unknown agent) are two compounds investigating by Allergan.32 Phase II clinical trials of AGN-199201 has been completed and some results have been published.33 AGN-190584 has been registered and patient recruitment has yet to begin. Oxymetazoline is an α-adrenergic agonist, has a vasoconstrictive effect and is used as an ocular anti-hyperemia agent. At the same time, it produces mydriasis by the α-receptor agonistic effect on the iris dilator muscles, which decreases the depth of focus and unwanted effects in presbyopia treatment. AGN-199201 may be added to the formulation to reduce the adverse effects of AGN-190584, like hyperemia or strengthen the effect of AGN-190584 by decreasing systemic absorption and elongating retention time in the eye.32–34

Another option for presbyopia treatment is using sympathetic antagonist with muscarinic agonist. A muscarinic agonist and an α-sympathetic antagonist agent could act synergistically on miosis, increase pseudo-accommodation and also decrease ciliary body spasm. The decrease in pupil size increases focus depth and hence improves UNVA. There are two formulations: pilocarpine with dapiprazole and pilocarpine with thymoxamine.35 Thymoxamine is a competitive post-junctional α1-antagonist. Sympathetic innervation has very little effect on the ciliary muscle (as opposed to muscarinic agonistic effect), thymoxamine changes the pupil size without affecting the ciliary muscle significantly. The half-life of thymoxamine is ten times longer than the 1 hour half-life belonging pilocarpine.37 Ninety minutes later, after using thymoxamine pupil diameter reduces about 1.6 mm and accommodation increases 1 D.37

Dapiprazole is another sympathetic antagonist, which has a same mechanism of action as thymoxamine. In a study, dapiprazole 0.5% has been used, accommodation increased much more with two drops than one drop and brown eyes had a slower response.38

The other group of sympathetic agents is α-blockers. There are α-adrenergic receptors on the iris and also the ciliary muscle. The α-blockers create CM contraction, myosis, and increase accommodation. Timolol has some important systemic side effects which limited its usage. Neufeld prepared and patented a drop which contains only α-blockers, but no study has been done about its effect on presbyopia. 39

In conclusion, pharmacological drop treatment may contribute to the development of a useful treatment modality for some presbyopic subjects with specific near-vision needs; although further studies are needed to clearly understand its advantages and limitations.

Article Information:

Feyza Çalis Karanfil and Burak Turgut have nothing to declare in relation to this article.


Burak Turgut, Yuksek Ihtisas University, Faculty of Medicine, Department of Ophthalmology, 06520, Ankara, Turkey. E:


No funding was received in the publication of this article.


This article is published under the Creative Commons Attribution Noncommercial License, which permits any non-commercial use, distribution, adaptation and reproduction provided the original author(s) and source are given appropriate credit.




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